Hey, InhalingBullets, I think I lifted the best statement for your position from the Machinerylubrication article. It states:
Quote:
The best protection against wear is probably a product that is a little thicker (such as SAE 10W-30 or 15W-40) and has more antiwear additives than the oils that support the warranty. The best oil for your vehicle depends on your driving habits, the age of your engine and the climate you drive in, but it is not necessarily the type of oil specified in the owner’s manual or stamped on the dipstick.
This is actually very interesting because even if we were to take it as true for the sake of the discussion, we would then also need to take as true the statement that internal engine wear, in the preponderance of circumstances, is not going to be the failure mode that shortens the life of the engine.
Basically, off spec, thicker oil is a solution looking for a problem.
And, depending on how off spec it is, it can actually lead to more instances of LSPI and significant engine damage.
How do we know this? We know this because the D1G2 spec oil has been specifically formulated to address LSPI.
Now if we say we want to go off spec 'just cuz'. Well, that's fine, but please don't say that you would go off spec to preserve the life of the engine in any appreciable form that would impact the ownership experience.
Looking forward to your response!