Additives do not deplete and/or wear out during the lifespan of an oil change nor does the base stock wear out either. Oil eventually needs changing due to many factors, but the majority of the time it's due to ones I listed above.
Oil looking dark and/or dirty is actually a great thing. It...
First off, you can call it billy bobs but that is far and away the most respected website for oil discussion/information on the interwebs.
Second, sure the base stock works in conjunction with the additives but it certainly isn't "a very small part of the finished product". Just as with the...
There is quite a bit of willfully ignorant misinformation going around in this thread. It's to be expected though. Not many people care to spend any of their spare time researching oil or becoming a tribologist.
For those of you that have an interest in this subject I highly encourage you...
I'd use M1 0W40 over Amsoil simply due to the fact that it's available at any local Chinamart for less than $5/quart. Amsoil wants $11.50/quart for their 0W40.
From the research I've done on BITOG M1 is the highest quality 0W40 currently available other than maybe the one offered by Redline...
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