Quote:
Originally Posted by fatty335
So that is the million dollar question, isn't it. Based on my research and opinion, I suspect it is a combination of many factors, to include:
Design (tight tolerances, bearing composition, etc.)
Factory recommended OCIs that almost all followed due to lease/free maintenance
Driving style (i.e. driving hard on cold oil)
Improper or delayed maintenance
Poor quality fuel
Tuning
Obviously these are weighted differently in each instance but I suspect they all come into play in some measure. I doubt anyone will ever be able to narrow it down to one thing.
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Yeah would make sense to be a combo otherwise there would be a lot more failed engines before 100k miles. What fuel do you use, 91 or 93?