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Patrick Hardy
10-09-2007, 03:24 PM
I know that this topic has been talked about numerous times before, but here goes again. My Mastercraft manual says that I should use SAE 20w-50 Racing oil, but the Indmar manual says to use Pennzoil Marine 15w-40 oil. What is the general consensus on what oil to use? Thanks for any / more help on this well worn topic.:confused:

bigmac
10-09-2007, 03:27 PM
Any of the 15W40 CI-4/SL diesel oils, like Pennsoil Marine or Rotella-T will be fine, and meet Indmar's oil recommendations.

lanier92prostar
10-09-2007, 04:19 PM
I have been reading this and another thread about oils. I have a question: This use of diesel oils only applies to the newer models. Which years and engines are people using the HD oils?

east tx skier
10-09-2007, 04:30 PM
I used the Pennzoil 15W40 mentioned above in my 93 Pro Star after calling indmar and asking them specifically about that engine and that year. So I think the answer to your question is yes, the current recommendation applies to your 92 Pro Star even though in 92, they recommended SAE 30.

bigmac
10-09-2007, 04:45 PM
Right. Indmar currently recommends the CI-4/SL 15W40 diesel-types oils for every engine they've ever made.

86mcskier
10-15-2007, 02:00 PM
I have a '93 PCM 351 and rather than starting a new thread, I figured I would try to get my answer here. What oil should I use? I was looking on mobil 1's site and I saw 0-40, 15-50, high mileage 10-40, and diesel 5-40. Which of these would be the best? Any opinions? Thanks a lot.

bigmac
10-15-2007, 02:02 PM
Rotella T or Pennzoil Marine (diesel)...15W40, can't go wrong there. Synthetic would be a waste of money.