Dealer put 5W30 into GT
10-31-2006, 12:38 AM
#11
Join Date: Dec 2004
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Posts: 44
RE: Dealer put 5W30 into GT
You really don't have anything to wory about. Here's the scoop on viscosity ratings.
"The API/SAE designation for multi-grade oils includes two grade numbers; for example, 10W-30 designates a common multi-grade oil. The first number associated with the W is not rated at any single temperature. The "10W" means that this oil can be pumped by your engine as cold as a single-grade 10 weight oil can be pumped. "5W" can be pumped at a lower temperature than "10W". The second number, 30, means that the viscosity of this multi-grade oil at 100°C (212°F) operating temperature corresponds to the viscosity of a single-grade 30 oil at same temperature. The governing SAE standard is called SAE J300. The motor oil grade and viscosity to be used in a given vehicle is specified by the manufacturer of the vehicle."
So the cold weather is not a factor, the 20 vs. 30 weight difference is slight at HIGH temps. Slight increase in oil pressure and internal drag - very friggin slight.
Sam
"The API/SAE designation for multi-grade oils includes two grade numbers; for example, 10W-30 designates a common multi-grade oil. The first number associated with the W is not rated at any single temperature. The "10W" means that this oil can be pumped by your engine as cold as a single-grade 10 weight oil can be pumped. "5W" can be pumped at a lower temperature than "10W". The second number, 30, means that the viscosity of this multi-grade oil at 100°C (212°F) operating temperature corresponds to the viscosity of a single-grade 30 oil at same temperature. The governing SAE standard is called SAE J300. The motor oil grade and viscosity to be used in a given vehicle is specified by the manufacturer of the vehicle."
So the cold weather is not a factor, the 20 vs. 30 weight difference is slight at HIGH temps. Slight increase in oil pressure and internal drag - very friggin slight.
Sam
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