Exceeding the OLM is not a warranty violation. Warranties only cover manufacturing defects, regardless of mileage. The oil would have to be proven to fail. Here is what GM has to say:quote:Originally posted by Trajan:
I'm not taking sides, just showing what I've found.
To quote a man who has been closely involved with car makers and oil for decades.."use a lubricant of the correct viscosity that is specified by the Manufacturer and Listed by them as Approved – especially when under any form of Warranty"
Of course, out of warranty, use what you will and be happy. But you won't go wrong doing the above.
ps, better RL or Amsoil than swill...synlube any day.
BTW, Exceeding the OLM is a warranty violation regardless of what oil you use.
“If engine damage otherwise covered by warranty
was found to be unrelated to the engine lubricant,
then the consumer’s practice with regard to oil
change intervals would not be a relevant considera-
tion, and the warranty claim would be honored.”
Fuels and Lubricants Division,
General Motors Research Laboratories
“The New Vehicle Warranty would not be void
simply because an owner failed to use proper
engine oils or did not perform maintenance at the
prescribed intervals. Warranty applicability is
contingent upon the cause of failure.”
Service Policies and Procedures Department,
General Motors Corporation “