Just did my first oil analysis on my boat engines. I'm surprised that they flagged the add packs as being different from what they expected. My guess is that since I stocked up on oil a year or two ago, that maybe Amsoil changed the formulation.
Also - the I ran ZDDP Plus in the Port engine, but not the Starboard engine. Little difference in wear but the Port engine is just a tad worse.
Also - the I ran ZDDP Plus in the Port engine, but not the Starboard engine. Little difference in wear but the Port engine is just a tad worse.
