Members Bill Cooper Posted July 31, 2011 Members Posted July 31, 2011 Interstate 24M-XHD meets the requirements for all Optimax Engines.If you have a core it is $118.63(taxes included) at Son Sac Marine. Optimax engines do require high CCA batteries, but with the correct size battery they still sound like they are dragging at first. The reason is the engine is pumping up the air rails with air pressure so the engine will start.
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