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rabner
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Member # 47495
Reged: 08/23/04
Posts: 2
Cheveron Delo 400 vs. Mobil Delvac Synthetic
#2006601 - 09/23/04 12:01 PM

I am currently using Delo 400 motor oil in my Duramax, but have heard if your doing heavy hauling it is best to go with the synthetic oil like the Mobil Delvac. What seems to work best for engine life? and how often do you change your oil with the synthetics?

The differences in synthetic and petroleum oils: As you may or may not know, petroleum oil is refined from crude oils stocks. This process is designed to purify the oil as much as possible and produce a basestock that will be available for additives to make different types of lubricating products. Synthetic basestocks are man made from various forms of hydrogen and carbon compounds. The making of the synthetic basestocks by chemical process is the key to their superior strength. The chemist can create designer molecules that are specifically designed for maximum lubricating qualities.

Lubricating oils are made up of the basestocks, as previously mentioned, and additives depending on the lubrication application. The additives consist of anti-oxidants, anti-wear, anti-foaming, detergents,dispersants, acid neutralizers, and pour point depressants.

mtnbkr132
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Reged: 05/30/02
Posts: 1530
Loc: North Carolina, USA
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2006744 - 09/23/04 01:43 PM

I use Mobil 1 truck and suv (its delvac in a new bottle) And i run it year round for 7500miles. Black stone says i could go a little longer if i wanted but 7500 is good for now.

wells

montanafan
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Reged: 04/30/03
Posts: 1089
Loc: South Central Montana
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2006933 - 09/23/04 04:00 PM

I have not seen any definitive proof that synthetic oil actually increases engine life over properly used dino oil. Also, if your oil is dirty, it needs changing whether it is synthetic or not.
Synthetic does, however, have some undisputed advantages over dino. It is more slippery and is more temperature stable. The VI can be stretched farther. I like the 5-40 synthetic in the winter for it's easy cold cranking qualities.

Tough_Guy
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Member # 39025
Reged: 02/05/04
Posts: 329
Loc: Hamilton, Montana
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2007047 - 09/23/04 05:00 PM

Are you going to own your truck longer than the warranty (100,000 miles)??? If so than maybe its worth it. A good dino oil like rotella or delo will do a good job.


Cheers

BigDaddyT
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Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2007186 - 09/23/04 06:52 PM

Ive run gassers out past 300k on dino and regular changes. I ran synthetic for the first time this last winter. It starts easier. Drives better when cold. And it sounds better. I think I will run synthetic in the winter from now on. The engine just sounds happier.

Tough_Guy
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Member # 39025
Reged: 02/05/04
Posts: 329
Loc: Hamilton, Montana
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2007307 - 09/23/04 08:13 PM

I run Delvac 1 in my PSD and my 6.5L work truck. I personally love synthetics, however I have over 150,000 on my 6.5L and 125,000 on the PSD....and I pull trailers with both.

Cheers

juggernaut300
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Reged: 04/08/04
Posts: 358
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2009188 - 09/24/04 11:41 PM

Dude thats the whole thing with synthetics and oil analysis, just because an oil "looks" dirty doesn't mean that it needs changing or its "bad" per se. The only way to really know when you need your oil changed is again oil sampling. Trust me when an oil actually is detrimental to your engine its so black it looks like it came out of a detroit diesel 2 stroke. (this is a generalization for a healthy engine, an engine in poor shape may need its oil changed long before this when it still looks new.) again sampling and analysis is the only way to TRULY know.

PH
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Member # 26182
Reged: 11/03/02
Posts: 574
Loc: Colorado
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2009532 - 09/25/04 09:19 AM

According to Gale Banks, synthetic oil will not coke at any internal temperature your diesel can make. That can save your turbo bearings.

montanafan
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Reged: 04/30/03
Posts: 1089
Loc: South Central Montana
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2009688 - 09/25/04 12:25 PM

Actually, "dude", I didn't say "looks dirty," I said dirty. I guess I should have used the word "contaminated," because dirt is not the only reason to change oil. Chemical corrosion is a big problem with extended mileage oil changes. It is an area where synthetics shine. However, none of this has shown me definitvely where synthetics make an engine last a measurable longer mileage.

shoebear
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Reged: 02/07/02
Posts: 2260
Loc: Colorado Springs, CO
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2012596 - 09/27/04 04:24 PM

Dirt and contamination are both reasons to change any oil, synthetic or not. I define dirt as solid particles suspended in the oil and contamination as chemicals dissolved in or liquids mixed with the oil. A third reason to change the oil is that additives have become depleted to the point where they cannot do their job any more.

A good bypass filter removes all but the smallest dirt particles such that the largest particles are several times smaller than the thickness of the film of oil between moving parts. Thus the remaining dirt does not affect wear. However, even then there could come a point when there is too much suspended dirt and the oil could start to resemble a paste. This is mitigated with regular full-flow and bypass filter changes which replace part of the oil and also help replenish the oil additives. So in theory, you can go indefinitely without a full oil change if you have a good running engine, synthetic oil, a bypass filter, and change the filters regularly.

Although bypass filters solve the dirt issue pretty well, contamination is another story. Suppose you have diesel fuel or coolant in the oil -- you need to change the oil, regardless of how "clean" it is. Contaminants go right through a bypass filter -- although some filters are designed to trap water, they can't deal with a coolant leak. In addition, there are other contaminants that may not be as bad for the engine, but could be detrimental just the same. For example, about 6 months ago, one of my glow plugs shorted and burned some wiring under my valve cover. The oil smelled like burnt insulation, even though I have an Amsoil bypass filter. I have no idea if those contaminants would have hurt my engine or not, but I did a full oil change just in case. Contamination is hardly ever discussed by proponants of bypass filtration because a bypass filter can't catch them. That's not to say that bypass filtration isn't a good idea, just that it doesn't guarantee never having to change the oil again the way some ads seem to say.

Does synthetic oil provide any practical benefit over regular oil? The following quote by TexasTowncar from this thread on bypass filters, although not a scientific, statistically valid test, convinced me that it does:

Quote:

Larry & Other interested folks,

Here is some information regarding the use of synthetic oil that you might find useful. Starting in 1991 I had a small group of 4 identical Ford Explorer's (4.0L V6, automatic trans, 4WD, SOF transfer case and hubs). After break in, 3000 mi., I started using Mobil 1 in two of them and the other remained on Mobil dino oil. I also had the transmission, transfer case and rearend fluids changed to Mobil synthetics.

When I sold the company in 1998, the vehicles all had around 380,000 mi. on them. These vehicles were randomly driven by five drivers including myself. They were used about 30% in the city and 70% on the highway. Oil changes and lubes were done by the same garage during the entire time at 5,000 mi. intervals. Oil analysis wasn't done until after the vehicles had a little over 200,000 mi., oil analysis wasn't offer in the area until 1995. The following cost of operation of each vehicle including fuel, oil and lubes, and drive train parts excluding tires, brakes, batteries, tuneup parts and air conditioner service.

Vehicle #1 (dino oil)
Final mileage - 388,000
Average MPG - 17.8
Cost of Fuel - $27901
Cost of Oil - $2627
Cost of Transmission - $1318 (at 194,000 mi.)
Cost of Motor - $2843 (at 214,000 mi.)
Total Cost - $34,689

Vehicle #2 (dino oil)
Final mileage - 384,000
Average MPG - 17.7
Cost of Fuel - $27769
Cost of Oil - $2594
Cost of Transmission - $1338 (at 214,000 mi.)
Cost of Motor - $2822 (at 238,000 mi.)
Total Cost - $34,523

Vehicle #3 (synthetic)
Final mileage - 385,000
Average MPG - 19.4
Cost of Fuel - $25402
Cost of Oil - $3411
Cost of Transmission - $327 (torque converter seal at 324,000)
Cost of Motor - $0
Total Cost - $29140

Vehicle #4 (synthetic)
Final mileage - 381,000
Average MPG - 19.5
Cost of Fuel - $25009
Cost of Oil - $3927
Cost of Transmission - $0
Cost of Motor - $0
Total Cost - $28936

The motors in the dino oil vehicles were replaced because of excessive oil use, #1 was using 3 quarts between changes and #2 was using a little over 2 quarts during the same period. Neither vehicle would pass emissions testing. Neither of the synthetic vehicles used oil. The dino oil vehicles transmissions started exhibiting shifting trouble and eventually failed.

How well do these results translate to the use of synthetics in the PSD? My experience is limited to the '00 that we use a test bed for various modification testing. During the past year the test bed truck has logged a little over 127,000 mi. on the dyno. It has had and continues to get serviced with all Mobil Synthetics including Delvac 1. In March I added a single bypass Oilgard filter and started oil analysis at 10,000 intervals. Based on the oil analysis at 68,000 mi., I decided to extend the oil change interval to 25,000 mi. with analysis and filter changes at 10,000 mi. Based on the last analysis I will likely extend the oil change interval to 30,000 mi.

The truck continues to average 18.2 mpg. Some have indicated that the test bed is an ideal environment. Actually it is not. I don't know of anyone that run their PSD at full load most of the time. Except for initial warm up, the test truck runs at full load, i.e., dyno load just at the point where the set rpm starts to drop.

Doug



I hope this is helpful.

TexasAggie
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Reged: 12/17/02
Posts: 665
Loc: Aggieland, TX
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2124984 - 12/02/04 09:53 PM

Is there a good place for Delvac 1 online? I can't find any locally.

BigDaddyT
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Member # 30170
Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2125020 - 12/02/04 10:07 PM

You aint got a wally world?

JimmyDee
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Member # 14718
Reged: 06/29/01
Posts: 4477
Loc: West Michigan Lower Peninsula
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2125060 - 12/02/04 10:19 PM

Quote:

You ain't got a wally world?



They don't have it at our Wall Mart.
Jim

BigDaddyT
Member
Member # 30170
Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2125125 - 12/02/04 10:41 PM

mobil 1 suv its called. Im out in the boonies and we got it.

roofeditor
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Member # 28949
Reged: 01/26/03
Posts: 7382
Loc: Florida
Re: Chevron Delo 400 vs. Mobil Delvac Synthetic new
#2125612 - 12/03/04 06:56 AM

Quote:

Mobil 1 SUV its called. I'm out in the boonies and we got it.




Oddly our old Walmart on the Island does not have M-1 Suv oil but over the bridge on the mainland there is a "superwalmart" that does?

JimmyDee
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Member # 14718
Reged: 06/29/01
Posts: 4477
Loc: West Michigan Lower Peninsula
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2126086 - 12/03/04 12:05 PM

Quote:

mobil 1 suv its called. Im out in the boonies and we got it.



I know and we don't have it.
Jim

BigDaddyT
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Member # 30170
Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2126391 - 12/03/04 03:42 PM

Guess Im lucky. Its cold here alot so the demand must be high enough to stock it. Its a little wally world not a big one.

BigChevy80
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Reged: 11/21/04
Posts: 41
Loc: El Paso, IL
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2126549 - 12/03/04 05:17 PM

Quote:

Ive run gassers out past 300k on dino and regular changes. I ran synthetic for the first time this last winter. It starts easier. Drives better when cold. And it sounds better. I think I will run synthetic in the winter from now on. The engine just sounds happier.




Why not just run synthetics in it all the time? Doesn't make much sense to change back and forth all the time.

I use synthetics in all my vehicles and have been very happy with them. One of the key benefits of synthetic is the possibility of extended oil change intervals. I run my vehicles 6000 miles between changes. I haven't had any type of oil analysis done, but I'm sure if I did it would tell me I could go well past 6000 miles. I just use the 6000 mile mark because that's when I rotate my tires as well. That way I can get both done at the same time.

The high cost argument of synthetics really doesn't hold up. Since I'm going twice as long as I used to with regular oil, I'm changing my oil half as much. If you figure that a quart of synthetic is about twice the price of regular oil, you're not paying any more.

Every vehicle that I've ever switched over to synthetic, I run the first synthetic change for 3000 miles and then change it again. Man you should see the oil that drains out after that first 3000 miles. It's usually pretty nasty looking, since synthetic oil will clean up sludge deposits. That's proof enough for me that synthetics are better than dino oil.

BTW make sure you get a REAL synthetic oil. Mobil-1 is the only true synthetic sold retail. Those other brands like Penzoil synthetic and Castrol Syntec are not made from true synthetic PAO basestocks. (there are other true synthetics like Redline, Royal Purple and Amsoil that you can buy from dealers or mail-order).

JimmyDee
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Reged: 06/29/01
Posts: 4477
Loc: West Michigan Lower Peninsula
Re: Chevron Delo 400 vs. Mobil Delvac Synthetic new
#2126550 - 12/03/04 05:18 PM

We here in Michigan think we know what cold is when talking to someone in South Carolina but I have a hunch we don't have a clue to what real cold is when talking to the ones from Alaska.
Jim

BigDaddyT
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Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Chevron Delo 400 vs. Mobil Delvac Synthetic new
#2126802 - 12/03/04 08:16 PM

We have a maritime climate here nearto anchorage. The water helps moderate the cold. The interior states. Such as North Dakota will see temps colder than what I usually see. -30 is uncommonly cold for here. But it can and will stay -15 for weeks or a month at a time. In the interior of alaska. Different story. Ive been up there when it was minus 60 to minus 70 degrees(not wind chill, actually that cold). Thats miserable cold. Stayed at a hot springs. Would run from the pool to the cabin. 100 ft or so. By the time I reached the cabin. My shorts and towel would be frozen solid along with my hair. You could actually bang the ice off on the floor. Flash frozen.

TexasAggie
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Reged: 12/17/02
Posts: 665
Loc: Aggieland, TX
Re: Chevron Delo 400 vs. Mobil Delvac Synthetic new
#2126956 - 12/03/04 09:38 PM

http://store.avlube.com/fonfacsizcol.html

Pat Dolan
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Reged: 08/28/01
Posts: 3283
Loc: Saskatoon, SK
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2127468 - 12/04/04 08:34 AM

Tom:

You make a good point (as usual). I too have never actually seen credible data that proves an actual engine lifespan advantage for full synth vs. dino. Any of todays fully qualified dino oils are so good, they probably mean that the rings and bearings are going to last as long as the engine overall, but I wil still cast my vote for a full synth (i.e. Delvac 1) for the starting ease, cold flow properties and high temp stability - plus the comfort for 10k drain interval.

Pat

BigDaddyT
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Posts: 2442
Loc: Eagle River,Alaska
Re: Cheveron Delo 400 vs. Mobil Delvac Synthetic new
#2127971 - 12/04/04 02:34 PM

Cold flow properties. This is where most the damage happens. On startup. I think it would be far wiser to get the oil on the bearings and rings sooner rather than later. This alone. Could make an engine last longer. Stick two engines in negative 50. Start em up let it reach operating temp and shut it off and do a complete cooldown. Repeat. Which do you think would last longer the one with oil that has a -15 pour point or the one with a -50 pour point.

I was starting my diesel unaided down to -25 or just a shy colder last winter. With synthetic. It is a different animal. Starts easier. Idles better after startup and has more power when cold. Cant tell me this wont affect overall engine life. Getting everything coated with oil as soon as possible is the best possible thing you can do for an engine.

JimmyDee
Member
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Reged: 06/29/01
Posts: 4477
Loc: West Michigan Lower Peninsula
Re: Chevron Delo 400 vs. Mobil Delvac Synthetic new
#2127981 - 12/04/04 02:46 PM

I worked at a paper mill where they did an experiment with oils. Mobil came in on a, close to zero day and did a cold start on the log crane. It took 15 seconds for oil to flow to the rockers as they view it with the rocker cover off. Changed oil at the end of the shift to Delvac 1 and repeated the next morning with weather about the same. It took 3 seconds for the oil to get to the rockers with Delvac 1. I've been using synthetics in my vehicles, in the winter ever since.
Jim

BigDaddyT
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Reged: 03/05/03
Posts: 2442
Loc: Eagle River,Alaska
Re: Chevron Delo 400 vs. Mobil Delvac Synthetic new
#2128175 - 12/04/04 05:05 PM

EXACTAMUNDO!!!

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