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I’m sure you can leave that blank but I bet if amsoil is doing the testing that they will figure out it is their own oil. In my Cummins I always looked at the silicon count and 24 would have been high enough for them to say I need to check my air filter. They didnt bring the silicon up this time...

I did one about 6k miles ago with ac delco and PPE 1140000650 filter. Truck will be getting amsoil within the next two weeks and I’ll get a sample of it too. Trying to find that wix filter has been a problem so might go back with another ac delco.

I feel the same way. Almost 19k miles usually tow at least 100 miles per tank but the few times I haven’t it generally gets 25mpg. Got 28 once and 27 twice though. I think it’s the best truck I’ve ever had

Was it burning oil before the catch can install?