Just did a search and could not find any information or comparisons with the Merc. Optimax oil on iboats.<br /><br />I have just ordered a 2005 Optimax 115 for delivery next spring and according to the Merc website:<br />"This new synthetic blend oil was developed specifically for the greater demands of DFI outboard engines. Higher operating temperatures combined with reduced oiling rates have put increased demands on the lubricants. This exclusive new formula provides increased lubricity while minimizing carbon deposits, helps reduce smoke and provides the highest protection for the engine. Not intended to be used in all applications specifying a TC-W3 oil".<br /><br />Is this the mystery "Amsoil" oil 
<br /><br />I have not received the motor and therefore read the fine print, but I assume my new warranty would be in jeopardy if I did not use the Merc recommended oil
<br /><br />I have not received the motor and therefore read the fine print, but I assume my new warranty would be in jeopardy if I did not use the Merc recommended oil
