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Old 09-22-2019, 06:55 PM   #2
51 MERC-CT
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Join Date: May 2010
Location: East Hartford, Ct
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Default Re: Oil Detergent - Rislone ZDDP

The Shell Rotella appears to already have ZDDP in it.
The ZDDP is not a detergent but enhances lubrication.
If you do some research on line there are reports that say too much ZDDP can be detrimental to an engine.
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