Quote:
Originally Posted by scrubjaysnest
They don't have to prove anything if the owners manual says DO NOT USE synthetic oil.
|
Again, if a synthetic meets the API spec for that engine or diff and they can not PROVE the product caused the failure, it is against the law to void the warranty, no matter what is in the owner's manual.
http://en.wikipedia.org/wiki/Magnuso...s_Warranty_Act
Koz