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I started up my 97 Sport Nautique this summer and noticed that it seems to smoke more than it used to. I get blue/white smoke and a nice sheen on the water behind my boat if I let it idle for a while. It seems to run fine and has no loss of power or no missing. I just changed the plugs wires dist cap and rotor and changed the oil. I put 10w30 mobile 1 in and I think I am going to change it again to 20w50 and a motorcraft filter. I noticed the oil pressure runs at 40psi until it warms up then it drops to 20psi at idle but goes back up to 40psi when I run it at speed. Any ideas or am I being too overly cautious??
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I went out and ran it some more today and it appears to be missing at idle. It vibrates/shakes slightly when idling or cruising at idle but it smooths out when the boat is brought up to speed. -
The GT40 needs 40 weight oil with zinc (flat tappet engine). Valvoline racing VR1 is what a lot of people recommend. Some of the 15/40 diesel oils also contain the necessary zinc additive and might work better for cold starts. You definitely need a heavier oil though.Comment
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