Hi got a Yamaha 9.9 four stroke 1985 and would like to change the oil. <br /><br />I dont have a manual to it. Can anyone tell me how much oil I need to buy (believe it's 10W-30)and what are the correct sparkplugs and plug gaps for this engine?<br /><br />Thanks
<br /><br />Please obtain a service manual prior to doing any work on your engine, Don't take any unnecessary chances