i have 2000 Johnson 90hp outboard motors. the oil is injected from tank. i would like to use penzoil synthetic blend but my oil reservior tanks are not empty yet. would it hurt anything if i go ahead and pure in the new stuff? or do i have to run it out before putting it in? is this new blend better to use then the traditional marine 2cycle oil? thanks for any help that you can provide.
I don't think it would matter, just make sure that the 2-stroke oil is the same concentration, I saw 2-stoke oil on sale at West Marine, I looked at the "50:1" fuel ratio and it was something like 3.5 oz. of oil to every gallon of gas, as where the other major oil brands are 2.8-3.0 oz. of 2-stroke oil to every gallon of gas (It's cheaper but, you must use more of the WEST MARINE oil). I have a 2005 Johnson 50 h.p, I paid EXTRA to have the "VRO" removed, and add the oil manually to the fuel (It's only a 7 gallon tank, so it's no biggie for me, a larger motor would require a lot more mixing of fuel)
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