Not Ranked
The Mobil1 numbers are accurate, I contacted them. They also told me not to use their 5W-30 or 10W-30 in a flat tappet engine because of the reduced ZDDP level. If the bottle has a "Starburst" symbol it has the lower ZDDP amounts (600 to 800 PPM).
The only reason I pay $11 per quart for the Redline 5W-30 is for the higher ZDDP.
Bob
Last edited by Bob In Ct; 10-22-2009 at 11:17 AM..
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