Blufinn Posted March 13, 2008 Share Posted March 13, 2008 I have a 1990 90 hp Johnson VRO and have been running amsoil in it for about a year (maybe 4 tanks of fuel) would it hurt to switch back to OMC oil? I don't feel any major difference since using it except for the price. Link to comment Share on other sites More sharing options...
fishorgolf Posted March 13, 2008 Share Posted March 13, 2008 It went 17 years with OMC oil before you put the new oil in. Link to comment Share on other sites More sharing options...
Jack Stasney Posted March 13, 2008 Share Posted March 13, 2008 Is this engine a 2/4cycle. I put Amsoil in my old 18hp from the 70's because I just wanted to try it. I could definitely tell the difference when trolling at low idle. The engine responded better out of the gun and pushed my boat a little faster too. Link to comment Share on other sites More sharing options...
marine_man Posted March 14, 2008 Share Posted March 14, 2008 If it's a VRO it's got to be a 2 stroke.marine_man Link to comment Share on other sites More sharing options...
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