Originally Posted by earthbound
Originally Posted by JLTD
Did you guys read my post?
yep...and that's malarkey too......you really think using supertech all it's life will yield (hypothetically now) engine A 200k and engine B (with premo of the crop) 250k-275k of useful life..
I was more noting the fact that there was only 777 bashing, and am attempting to keep the thread on topic.
Apparently I didn't make myself clear. Take 2 identical vehicles. Put City Star in one, PP in the other. CS is a horrible oil and I know it doesn't meet specifications; however it suffices as a tool to clearly demonstrate the situation. The CS vehicle's engine will wear much faster than the PP engine, and therefore the PP engine will last much longer. If, and note I say IF there is a disparity in the protection provided by two different oils, one engine will wear faster and therefore not last as long. How much longer is anyone's guess so to answer your question - no, I can't put a number on it.
Perhaps you didn't understand my example, from actual UOAs, where M1 produced more than twice the iron of other oils tested. Are you telling me that won't make a difference, ANY difference, in longevity?
In the CS vs PP example above, it would be a huge difference. In choosing any two oils that meet the certifications, there may be a lesser difference in measurable wear, or there may not. But IF there is, then one oil will cause that engine to wear more quickly and therefore not last as long. We've seen a disparity in wear metals in the same engine using different oils, and comments such as "that's not a good report, it's obvious your engine doesn't like xxx oil". Only a fool would continue to use the oil that gives them the worst UOAs.
And you obviously haven't read the threads about longer OCIs causing less wear than shorter OCIs. Please do.
Unfortunately at the end of the day, there's no hard data that indicates just how much this theoretical difference in wear would be, nor is there any data I've seen that indicates that a certain aggregate ppm of iron/copper/aluminum spells the end of any particular engine. But it's an interesting topic of discussion if one can open one's mind to the concept.