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Registered
Join Date: Mar 2003
Location: SW Cheese Country
Posts: 13,655
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Quote:
Originally Posted by onewhippedpuppy
Remember that the OEMs are financially incentivized to maximize their fleet wide MPG, which has led to the spec of increasingly thin motor oils. Similarly they are motivated for your car to get past the warranty period with minimal issues, but after that point they make money when your car breaks. So blindly trusting the OEM or dealership may not always be in your best interests.
A good example is my RX8. They went from recommending 5W-30 in the RX-7 to 5W-20 in the RX-8 to combat the rotary’s notoriously crappy MPG. But the rotary engine building industry unanimously recommends against using either, as rotary engines run hot and need an oil less prone to breaking down. Most rotary engine builders recommend something like 15W-50 and will void your warranty if you use 5W-20 per the book.
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GM is the latest to have issues with a weight too thin.
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Brent
The X15 was the only aircraft I flew where I was glad the engine quit. - Milt Thompson.
"Don't get so caught up in your right to dissent that you forget your obligation to contribute." Mrs. James to her son Chappie.
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