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Blue Flame Restorations · 07-25-2011

Most oils have a rating of SN now. Look at the back of the oil bottle. For an oil that has the zinc for older engines, look for the SM code on the label on the back.

My engine builder had a new engine flatten the cam and sieive the motor at startup. Costly. He now uses the additive and oil with the SM rating.

07-25-2011	#15
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,899	Re: Rizlone ZDDP additive Most oils have a rating of SN now. Look at the back of the oil bottle. For an oil that has the zinc for older engines, look for the SM code on the label on the back. My engine builder had a new engine flatten the cam and sieive the motor at startup. Costly. He now uses the additive and oil with the SM rating. __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project