Thread: Mobil-1 Racing oil?
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Old 06-02-2004, 09:22 PM
Cal Metal Cal Metal is offline
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More additives makes for poorer lubricity. That is why 10W-30 is preferred over 10W-40. To get the 40 to perform at a pour rate of 10 takes more additives, which means less oil for lubrication.

I concur with Bob on the weight issue, too.
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