10-30-2008, 09:00 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
Roush oil, in the 5W-30 viscosity, has the same ZDDP level as Mobil1 0.08% (800 PPM). It probably has the "starburst" at that viscosity. Almost all synthetics have higher ZDDP when you go to their higher viscosity oils - 15W-50, 20W-50. The trick is getting the higher ZDDP at the lighter weights.
Bob
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