Ya know I've never thought about it in those terms. I've got a Yamaha four stroke and a Merc two stroke and even though I use Amsoil 100% synthetic in both I just never thought about the 75% of the engine oil life before in a 4S. Good point! FWIW.....I get my Amsoil HP 100% synthetic two stroke for $32 a gal delivered to my door. It can be used in the eTec at the same computer setting as the Evinrude 100XD.
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