Looking to upgrade to a synthetic for your Merc Stern Drive or the power plant that sits in front of it? If your engine is old enough to have a flat tappet cam you should strongly consider NOT using oil from your local parts shelf. Make sure you are running an oil that will support the cam to lifter interface. Modern "car" oils do not contain the proper additives to keep your cam alive.
Check out the oils listed below for your performance
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10W-30 Race Oil
Provides superior performance and maximum protection in high-performance and racing applications. DOMINATOR is engineered from advanced synthetic technology to better withstand the elevated rpm, high temperatures and shock-loading common to racing applications.
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