Re: Volvo penta 4.3 AQ430 changing outdrive oil
Just did this on my 1988 290 SP outdrive. Don't know if yours is similar, but mine has a dipstick on top the outdrive that you check the fluid level with. In order to fill the outdrive, you have to remove the back cover, and remove the fill plug in order to fill/ or top off. Down at the bottom of the outdrive is the drain plug. The manual on mine says to fill with 10W-30, however my mechanic just replaced a few seals, flushed the outdrive, and he added 90W synthetic, told me it's great stuff for the outdrive. I sure hope so!