02-09-2010, 07:17 PM
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#11 (permalink)
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Enthusiast Member
Join Date: Jan 2010
Location: Alpharetta, GA
Posts: 267
Drives: 2010 370Z Nismo TT
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Quote:
Originally Posted by ChrisSlicks
I have looked at the chart, and the viscosity at 220 degrees is well within operating range. The lower viscosity does not cause breakdown in within itself.
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The debate is not whether or not 220 is within operating range, but whether or not it will be sufficient for protection after 7500 miles. The answer is no.
And you are correct, lower viscosity does not equate breakdown...but, with rising temperature viscosity drops and metal-to-metal contact begins. Engine wear is greatly accelerated. Viscosity breakdown begins when temperatures exceed the viscosity's rating.
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