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Old 07-28-2001, 09:26 PM
Posts: n/a
The flow characteristics of a 10w-40 oil matches what a straight 10 would do in cold ambient temps as well as a straight 40 at the higher temps. And yes the w stands for winter but is referred to as weight (why, I don't know). I don't know why the 80 weight aircraft oil is actually referred to as 40 and the 100 as a 50, either. Perhaps there is a 'proof' involved in aviation.
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