Quote:
Originally Posted by Karl
I just went ahead and purchased 5w30 Mobil 1 synthetic extended performance oil.
They also say the car can use 0w30 oil also.
"Based on what you've told us, your vehicle manufacturer recommends a 5W-30 viscosity and oil that meets GM4718M. A 0W-30 viscosity can also be used. The manufacturer has factory filled your vehicle with Mobil 1 oil and also endorses Mobil 1 as the service fill oil. Your engine oil capacity is approximately 8.6 quarts. We offer these motor oils to help protect your vehicle"
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None of this is based on testing, just so you're aware. This is based on superseded part numbers and specifications and GM contractual obligations with Mobil 1.
It's comparable to saying you can run 87 octane pump gas in your 1920's automobile because that was the replacement for leaded gas...