Thread: 75w90 vs 140?
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Old 12-13-2012, 11:16 PM
spectre6000 spectre6000 is offline
Join Date: Mar 2012
Location: Coal Creek Canyon
Posts: 299

It'd be like putting zero weight in your 40's crank case. Accelerated wear and the potential to bypass seals/gaskets creating leaks that weren't previously there. The lighter oil wouldn't handle the heat as well either.
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