What kind of oil to use

[HT32BSX115]

Howdy all, <br /><br />I have an 87 FourWinns 211 Liberator with a 460 Ford V-8 engine. (King Cobra) The OMC service manual suggests straight 30wt oil and even says multi-grade oils are not recommended. Does anybody know why they might suggest to NOT use multi-grade oils? Even Ford suggests 5W-30/10W-30 in the 460 in most automotive applications. I was planning to use Shell Rotella 5w-40 synthetic. Maybe over kill but I use it in everything else.<br /><br /><br />I know oil threads can get pretty emotional but I cannot see any reason for using straight weight oils in anything these days.<br /><br /><br />Thanks, <br /><br />Rick

 

[Fishermark]

Re: What kind of oil to use

I was going to point to a post that covered this in DETAIL, but the search function seems to be dead. Is this because of the recent problems with the site being down? (The search page comes up, but seems to be unable to find any old posts).<br /><br />If and when if works again do a search and you will find a LOT of info.<br /><br />Emotional? No, you're kidding!

 

[Don S]

Re: What kind of oil to use

The OMC service manual suggests straight 30wt oil and even says multi-grade oils are not recommended. Does anybody know why they might suggest to NOT use multi-grade oils?

Boat engines operated different than automotive engines. That is the reason OMC, Mercruiser, and Volvo all have specs other than automotive.<br /><br />Since OMC no longer exists and hasn't for many years, don't expect to see any new information from them. Below is a copy of the NEW Mercruiser spec for oil, and Volvo is basically like Merc.<br /><br />BUT, in reallity, if you change your oil at least once every 100 hours or once a year and run your boat at rpm's of other than wide open throttle then about any oil will work. Besides, there isn't anyone here doing any oil comparison checks, they just say "_________ type oil works for me", and trust me, about every type oil out there is used for boats.<br /><br />

 

[HT32BSX115]

Re: What kind of oil to use

Thanks, <br /><br />I'll try the search again. WHe it finally works I'm sure I'll get hundreds of hits!

 

[trog100]

Re: What kind of oil to use

not much point in useing light weight 5-40 stuff either in a boat engine.. its the thick end thats nore important in these old engines not the thin end.. i wouldnt even put that in my car... he he he<br /><br />purely totally biased personal opinion thow.. whoops..<br /><br />trog