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myster
08-04-2011, 12:03 PM
OK So I mistakenly bought 20W50 motor oil instead of the recommended 15W40 for my 2008 Indmar 5.7 340hp.......My first thought is it should work fine, a little thicker is all!! Opinions????? :o

yippikaiyay
08-04-2011, 12:48 PM
My old boat, with the Indmar, (1997 5.7 GM, 275hp) actually spec'd 20W50.
I would leave it personally, and switch back next oil change. Just ensure good long warm ups before pulling anyone.

j.mccreight@hotmail.com
08-04-2011, 01:54 PM
From indmar
Indmar recommends (and uses at our factory) Pennzoil Marine 15W40 Motor Oil. If Pennzoil 15W40 Marine Oil is not available in your area, we suggest using 20W40 or 20W50 oil meeting the API specification of SJ/CG4 or better.

doesn't matter the brand as long as its meets this api, 20-50 will been just fine

http://www.indmar.com/About/ContactIndmar/faq.html#2.4

myster
08-04-2011, 03:04 PM
As I suspected......but it definately feels better when someone else chimes in, especially with specs from Indmar.....Thanks Much!!!!!!:D

dummy
08-05-2011, 11:17 AM
I'd run it with the heavier oil...no worries.

On the flipside, I just changed the oil in my '00 LTR and went with 10W40 Royal Purple full synthetic. I had it left over from a big-block dyno session I did, so figured why not. I've run 10W30 in a small-block Vortec crate engine in the dunes in the desert at sustained high rpm and high ambient temps with no issues. Took that same engine out of the vehicle and whanged it on the dyno for over 100 full-throttle pulls changing cam, intake, and heads. Pulled it apart and it was still good as new inside, so I reassembled and stabbed it back in the vehicle. Still going strong...all with 10W30 Valvoline dino oil.

Still, I feel the sustained high-load of a boat (or airplane) prop is harder on the main bearings than in a car or truck, so I'd stick with 15W40 or better for dino oil or 10W40 or better for full-synthetic.

gr82bgreen
08-05-2011, 01:33 PM
I'd run it with the heavier oil...no worries.

On the flipside, I just changed the oil in my '00 LTR and went with 10W40 Royal Purple full synthetic. I had it left over from a big-block dyno session I did, so figured why not. I've run 10W30 in a small-block Vortec crate engine in the dunes in the desert at sustained high rpm and high ambient temps with no issues. Took that same engine out of the vehicle and whanged it on the dyno for over 100 full-throttle pulls changing cam, intake, and heads. Pulled it apart and it was still good as new inside, so I reassembled and stabbed it back in the vehicle. Still going strong...all with 10W30 Valvoline dino oil.

Still, I feel the sustained high-load of a boat (or airplane) prop is harder on the main bearings than in a car or truck, so I'd stick with 15W40 or better for dino oil or 10W40 or better for full-synthetic.

I have some mobil delvac full synthetic diesel oil. cj4. would it be ok to use.

j.mccreight@hotmail.com
08-05-2011, 01:58 PM
Yes, CJ-4 is the current certification. CG-4 is obsolete.