Mix in Rotella synthetic 5W-40 with dino 15W-40? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-17-2008, 08:57 AM   #1 (permalink)
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Mix in Rotella synthetic 5W-40 with dino 15W-40?

Last night I picked up oil at Wal-Mart since I'm due for a change this week and I noticed that they just started carrying Rotella full synthetic 5W-40 at $22.00 a gallon. I can't justify doubling the price of my oil changes (Rotella dino 15W-40 is $11.00), but I thought what the hell and bought 1 gallon of the 5W-40. I thought maybe mixing in a gallon might lessen the morning romping that I'll be getting any day now that the temps are heading for the low 20s around here. It just popped into my head though that there might be a reason NOT to mix the two? Anybody want to comment? I'm probably just being over cautious but it never hurts to ask.
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Old 11-17-2008, 09:53 AM   #2 (permalink)
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If you mean pour in 4 quarts of synthetic along with 11 quarts of dino when you change the oil, it won't hurt a thing. It probably won't help much either, but it shouldn't hurt anything. You'd wind up with a DIY blend.

Any time you change oil, you're going to change only 15 quarts of the total 16 quarts in the system. There's about a quart in the high pressure oil reservoir and oil passages in the engine that won't drain. So when you get done, you'll have one quart of old oil, 4 quarts of 5w40 syn, and 11 quarts of dino 15w40. That should work fine as long as you're not expecting the wintertime starting ease of all 5w40 syn.

But the next oil change I'd send in an oil sample to Blackstone for analysis. Tell they your blend of oil, and ask what the results are, good or bad, of using that blend. I'll bet they say the blend was fine and dandy.
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Old 11-17-2008, 11:57 AM   #3 (permalink)
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There's no shortcuts or advantages to mixing like you did. If you can't justify the increased price, then you'll have to put up with your romps and harder cold starts.

The price difference between using 15 quarts of the 5W-40 compared to the 15W-40 is $41.25. Subtracting what you'd pay for the 15W-40 anyway, you've already got $11.00 more into the 5W-40, leaving you to come up with $30.25 more for the rest of the 5W-40. Don't forget you could probably run the 5W-40 syn a little longer.
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Old 11-17-2008, 12:01 PM   #4 (permalink)
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There's no shortcuts or advantages to mixing like you did. If you can't justify the increased price, then you'll have to put up with your romps and harder cold starts.

The price difference between using 15 quarts of the 5W-40 compared to the 15W-40 is $41.25. Subtracting what you'd pay for the 15W-40 anyway, you've already got $11.00 more into the 5W-40, leaving you to come up with $30.25 more for the rest of the 5W-40. Don't forget you could probably run the 5W-40 syn a little longer.
Eh...it was just a thought, looks like its back to 15W-40.
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Old 11-17-2008, 12:30 PM   #5 (permalink)
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If you're going to run the 15W-40, you could always put a small stick-on pad heater on the bottom of your oil pan (I use the Pro Heat #512). That will cure your cold weather romps. Also consider a diesel rated 10W- dino oil...they will usually have better cold weather viscosity properties than the 15W- at the same low price.
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Old 11-17-2008, 01:01 PM   #6 (permalink)
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My first oil change at 1000 miles was with 4 qts. of syn Rotella, 10 qts. of dino Rotello. At the 3000 mile change it was 8 qts syn Rotella, the rest dino Rottello. At 5000 miles it was all syn Rotello and it's been that way since.

The syn will help it start on cold mornings - at least that's what I've been told. I have no personal experience with it in my PSD since I highly doubt there's many here who consider temps in the 30-40s "cold".
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Old 07-15-2014, 09:06 AM   #7 (permalink)
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I ran a 50/50 mixture of shell rottella dino and shell rotella sythetic for 7500 miles in a 2005 ford 6.0 No problems, leaks or burning. I then had the oil changed at 150,000 miles at a local shop before last winter. They put in kendell dino. A good oil but with the extra cold winter last year the engine cranked to slow. I drained the oil at 1500 miles and put the 50/50 rotella mix back in. The engine cranked like a full synthetic was installed. I have 6000 miles on it presently. I plan on continuing with this mixture. On another site A shell lube engineer stated that these two oils are completly compatible. He gave his name and phone number to boot. He said that a 50/50 mix of 5w40 sythetic and 15w 40 dino will give you a semi blend of 5w40.
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Old 07-15-2014, 09:50 AM   #8 (permalink)
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Hi, James, and WELCOME! to TheDieselstop. You went way back to 2008 to find a thread you wanted to discuss. I'm glad you're doing your homework before you begin posting.
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Old 07-15-2014, 09:57 AM   #9 (permalink)
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Quote:
Originally Posted by james j neiweem View Post
I ran a 50/50 mixture of shell rottella dino and shell rotella sythetic for 7500 miles in a 2005 ford 6.0 No problems, leaks or burning. I then had the oil changed at 150,000 miles at a local shop before last winter. They put in kendell dino. A good oil but with the extra cold winter last year the engine cranked to slow. I drained the oil at 1500 miles and put the 50/50 rotella mix back in. The engine cranked like a full synthetic was installed. I have 6000 miles on it presently. I plan on continuing with this mixture. On another site A shell lube engineer stated that these two oils are completly compatible. He gave his name and phone number to boot. He said that a 50/50 mix of 5w40 sythetic and 15w 40 dino will give you a semi blend of 5w40.
I would say it's more like 10w40...
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