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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 02-10-2008, 07:02 AM   #1 (permalink)
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oil foaming?

I have been told by fellow PSD owner/enthuisiasts that foaming of the oil is a problem on the 7.3 and can cause performance and longevity issues due to the process used for the high-pressure injection. I asked a well-known engine oil analysis firm about this, and their response was:
If foaming was an issue with the 7.3L we would see a lot more silicone in oil samples than we do. Anti-foam additives are silicone-based since silicone sheds moisture and moisture is the real cause of foaming. You hear a lot of things, especially on the internet, but we don't think oil foaming is an issue for this type diesel or any other type we are familiar with.
What do the experts of TDS think? Is foaming an issue? Should a complete engine oil analysis include some measure of the resistance to foaming properties of the oil?
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Old 02-10-2008, 08:02 AM   #2 (permalink)
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The few times I've personally known of foaming in a 7.3l PSD, it was either the result of non-diesel rated oil being used, or a mechanical failure. Just my .01.....
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Old 02-10-2008, 08:55 AM   #3 (permalink)
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Not sure about foaming but I know old, dirty or crappy oil makes it run like crap. My truck runs a BUNCH better after changing the oil after I got it.
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Old 02-10-2008, 10:09 AM   #4 (permalink)
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Quote:
Originally Posted by Alabamatoy View Post
I have been told by fellow PSD owner/enthuisiasts that foaming of the oil is a problem on the 7.3 and can cause performance and longevity issues due to the process used for the high-pressure injection. I asked a well-known engine oil analysis firm about this, and their response was:
If foaming was an issue with the 7.3L we would see a lot more silicone in oil samples than we do. Anti-foam additives are silicone-based since silicone sheds moisture and moisture is the real cause of foaming. You hear a lot of things, especially on the internet, but we don't think oil foaming is an issue for this type diesel or any other type we are familiar with.
What do the experts of TDS think? Is foaming an issue? Should a complete engine oil analysis include some measure of the resistance to foaming properties of the oil?
If you use the improperly rated oil in a PSD the oil will foam and have an effect on performance. Anyone that has been around PSD's knows this. Foaming is not and "issue" for them to see since not many people are going to make a major mistake and put an improperly rated oil in a PSD. As far as the silicone in oil sample hypothisis, could be. I don't get my oil tested for that, maybe those that test TBN could tell us.
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Old 02-10-2008, 11:10 AM   #5 (permalink)
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As all of us Powerstroke owners know, using a good quality diesel oil (Rotella, Delo, Delvac, Motorcraft, Valvoline Blue) just to name a few is important with our engines. Not only does the oil lubricate and cool our engine, it helps our injectors fire with help from the HPOP. I have used the Rotella T 15w40 the last few years in my 7.3 with the MC #1995 oil filters with no issues at all. Whatever diesel oil is choosen, make sure it meets the proper specs. Your Powerstroke will run like a top.
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Old 02-10-2008, 11:24 AM   #6 (permalink)
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Use proper diesel oil, and never use oil additives. That will prevent all foaming issues. There is always some level of silicon in the oil. A virgin oil sample will always show silicon in a Blackstone report. It's the elevated levels of silicon you should be worried about.
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Old 02-10-2008, 12:23 PM   #7 (permalink)
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Make sure: 1)it is properly rated diesel oil (2) the right viscosity for your weather app.(3)don't overfill(4)don't use additives.
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Old 02-10-2008, 12:32 PM   #8 (permalink)
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Good points about not using additives, I forgot to say that. A good quality diesel rated oil will not require any additives.
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Old 02-10-2008, 03:59 PM   #9 (permalink)
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just on a side note, from word of mouth/reading I have also heard amsoil causing foaming in the 7.3L...have never used it so don't know from first hand experience
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Old 02-10-2008, 04:06 PM   #10 (permalink)
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I noticed Delo was mentioned earlier. Delo is not recommended in PSD's. It doesn't have the anti-foaming agent. While I say this we do have a '95 with over 300k miles on it and it's ran nothing but Delo
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Old 02-10-2008, 06:04 PM   #11 (permalink)
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i used amsoil in my truck once a while back, after about 500 miles it started knocking and making funny noises. change it back to rotella and it stopped
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Old 02-10-2008, 07:42 PM   #12 (permalink)
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I noticed Delo was mentioned earlier. Delo is not recommended in PSD's. It doesn't have the anti-foaming agent. While I say this we do have a '95 with over 300k miles on it and it's ran nothing but Delo
Delo is rated for our trucks. Look for CI-4 or CH-4 rating.
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Old 02-10-2008, 07:54 PM   #13 (permalink)
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I guess I didnt write this very well, cause yall missed my whole point.

This well known lab doesnt evaluate oil for anti-foaming properties because they say foaming is not an issue in the 7.3. I am using the correct oil (Rotela T) but the report I get back from the lab doesnt address the foaming and has no measure of the oils resistance to foaming after X miles of use. They say its a non-issue; do yall agree?
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Old 02-10-2008, 09:22 PM   #14 (permalink)
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If you use good oil it won't foam. The 7.3l doesn't have a foaming problem.

bobistheoilguy.com has shown that additives will foam though.
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Old 02-11-2008, 05:13 PM   #15 (permalink)
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I never used Delo in my 7.3 but have heard good things with this oil. I am using the Rotella T 15w40. My truck seems to do well with the Rotella. Delo I'm guessing, is second in sales behind Rotella.
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