I'm now in the process of switching my entire truck over to Amsoil synthetics and started thinking about the boat. The engine is a given, Amsoil 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil however I wanted to know if anyone is running synthetic in there V-drive and transmissions. I'm going to do a little more investigating but these units seem like they would benefit the most from synthetic based oils considering the strain we put on them. Any input? Steve
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