Originally Posted by catalyst
Yea i understand this.. but the way i see it is the M1 is supposed to last 15K miles with zero change in protection and peroformance.. it obviously does not.
Theoretically i should not have to change my oil for 25,000 miles, amsoil guarantee's the 5w-30 for that period of time and the 0w-30 for 37,000 miles.
Yes, that is correct^^.
I bought the oil from a dealer in my area, the dude who sells it was a really cool guy, he had a mopar hotrod that he had not changed the oil on on 7 years, dont think it was some hunk of junk either, it was a show winning peice, immaculate in everyway. Amsoil actuallt makes an oil filter/testing system for different applications.. Ie: they have a dual filter system and collection tank that they have intervals of replacement on. After a certain number of miles the collection tank its removed and sent into amsoil for a full oil analysis, depending on what is shown the oil is either kept for more use or replaced. The guy that i bought the oil from had this system on his hotrod, and he said that the oil was the same on a molecular level as it was almost 7 years ago.
First off, you can use M1 extended performance for 15,000 miles. The catch is that you MUST change out your filter every 5,000, or you will overflow the filter and cause the dirt and impurities to enter back into the system. That is the main reason why it looks like it could not hold it's own for 15,000 miles. It will be the same with Amsoil.
Also, you can have synthetic oil sit for 7 years and have it be fine. It will not change one bit. You can not base synthetic oils off of years, but ONLY off of milage. For all what you know, that car could have just sat in the shop for 7 years. Also, im not 100% sure on this, but wern't synthetic (atleast full synthetic) oils a recent discovery like 5 years ago? One more thing, I'm not up for sending in a collection tank to Amsoil everytime I need my oil checked. Shipping alone for those type of contaminates "legally" must be up in the 30s to 40s anyway. It would be best to just go ahead and get fresh oil into the system.