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Here’s the answer from GM Powertrain:
“GM4718M is General Motors' High Performance engine oil specification. Oils which meet GM4718M tend to be made from synthetic base stocks, so it is often referred to as a "synthetic" specification.
“However, not all oils, synthetic or otherwise, are capable of meeting the stringent requirements of GM4718M. Only the oils listed on the GM4718M Registered Products sheet have proven their performance to the specification.”
- Thanks to Matt Snider, GM Powertrain
Most synthetics mention GM 4718M in their list of claims; that's the unique spec created by General Motors for Corvette oil. It's a high-temperature requirement that tolerates less oxidation (thickening) and volatility (boil-off) on a standard engine test called Sequence IIIE, according to engineer Bob Olree of GM Powertrain.
also found this
(note: AMSOIL 0W-30 far surpasses GM's 4718M spec).
__________________
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Last edited by IT L GO : 10-14-2005 at 06:41 PM.
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