Please help sooth my buddy's fears

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My good friend has an 01' Silverado HD with a Duramax. He has 200,000 miles on it, runs Pennzoil LL 15W40 on a 5,000 OCI, the oil comes out about as clean as it goes in, and uses little if any. He could not be happier with the truck. Today on the job, he ran into some supposed diesel "expert guru" that proceeded to tell him that Long Life was a "light duty oil, the worst possible thing he use, and the only thing that kept the engine from blowing up already was the short OCI. The "expert" said that Rotella was only marginally better, Valvolene was worse, an the only thing to use was Chevron. He then ridiculed my friends short OCI as a waste, that he should be using synthetic blend, ("don't use full synthetic") and then ripped him for changing his fuel filter at 10,000 mile intervals, despite the fact that I get the filters for him at ultra low fleet discount prices, and the D-Max is known for injector problems. I did my best to reassure my buddy, but I thought maybe some of you could help refute some of the "expert's claims. Thanks if you can help.
 
If the "expert" didn't substantiate his claims, there's nothing to refute. It's vapor, no matter what his credentials or reputation are. If I were your friend, I'd file it under "I" for "interesting" and move on.
 
He's gone 200k doing what he's doing. That should tell him he's on the right track.

Lot's of "experts" are of the "If you do this, you should be fine. Any volunteers" type.
 
Pay no attention to the "expert"...any of those choices that the expert mentioned would probably produce spectacular results in the DMax...guy obviously thought he was informed or intelligent.
Tell your friend to stick with what he's doing, because it is obviously is working and he's happy with it. Done.
 
First send your buddy to: http://pennzoil.com/documents/LongLife heavy duty multi and single grade.pdf

That Pennzoil meets the specs of some pretty serious diesel engine mfrs: including cummins and volvo. And Rotella is junk? ask almost any OTR trucker. billions of miles have been run with Rotella. my grandpa was a diesel mechanic. he never once bashed any oil.
Are 10k intervals on a fuel filter a waste? on a gas engine, yes. On a diesel - maybe. but I'd rather "waste" than have a plugged filter - especially on a diesel.
 
Hi,
Dieselbob - Experts abound! The mere fact that your mate's vehicle is where is at today (200k) is that he has done a lot of things right! IMO you should tell him to keep on going with what he's done up to now!
 
Everyone on here is being so nice. Tell your friend to tell the expert, old Johnny said stick it where the sun don't shine. He knows absolutely nothing about what he says. Please don't tell JB Transport, Stevens Transport, or UPS how bad than darn Long Life is. They all have millions of miles on that bad product.

The only thing the expert said that is correct is that Delo 400 is a good product.
 
Wow, if his current OCI and oil of choice has gotten him 200k miles without smoking or consumption, sounds like I wouldn't change a thing. The only thing I might look at is using 5W-40 for winter, but if he has been doing this for 200k miles, apparently everything is ok. I assume he has great oil pressure, etc.
 
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