The oil pressure on the the dash gage is kind of high at wot around 80, I know these are not the truest of gages. The manual says to use straight 30w oil and I've notice the previous owner had notations that he was using 30w racing oil. It also states do not use muti vis oil. The engine is a 1988 260hp. Is there anything else I can use it also says I can use straight 20w if the temps are cooler. I want to find a happy medium somewhere. Thanks for the help