quote:
Originally posted by G-Man II:
quote:
Originally posted by QuadDriver:
Can I get you and others to admit that after the first 3000 miles, the M1 is no longer as 'good as new' and in fact is now worse than just about any oil you can buy new?
I understand completely what you're trying to say, but I don't think it's quite that simple. This is something that you would have to substantiate with multiple UOAs to prove your premise. From my reading of the UOAs posted to this forum, I'd say that the wear numbers during extended drains with the better synthetics match or exceed the performance of conventional oils at short intervals when the wear metals are "adjusted" to ppm per 1000 miles.
Also, there are certain conditions that an engine can be subjected to in those "first 3000 miles" that can easily tax a conventional oil beyond its means. This is where having a synthetic in the sump can prove especially beneficial.
AS I pointed out in another post, synthetic oil is only appx 10% improved over non syn oil, and even then its a stretch. So fine, I give you an extended drain interval from 7500 miles to 8250 miles. The point still remains, the oil is no longer as good. It is solids loaded (or if its not then it has failed COMPLETELY as a motor oil), it has some fuel in it, and all oils have some wear in them. Syn oils simply create uniform hydrocarbon chain lengths. no more, no less. They have the same energy in the C-C and C-H bonds as non syn. period. they do not form cyclical molecures (hence they become the aromoatic family and boil off well below room temp) they do not form branched molecules else they form n,n-blank-tane, they shear nearly the same (the tiny amount of impurities in todays dino oil account for nearly all the shear) Dont get me wrong, I *use* syn oil, but it is NOT the elixir of youth and in no way shape or form is it of any use as a motor oil past a drain interval, trebly especially with what you can buy off the shelf brand new.
Lets put it antoher way: I have a truck with 215K miles on it running syn oil since I got it. I used 5-7K mile changes and tow heavy things every week. Lets say 'Joe' has the same truck, and he filled it when he got it with some syn oil, and ran UOAs for the same 13 years and used his truck exactly the same as I did, and he did it on 3-4 oil changes. which engine do you think has less wear? Which would you want to buy if they came for sale? I can get an entire 3rd grade class to answer this correctly, im hoping this BBS can also...
![[No no]](/forums/graemlins/nono.gif)