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  #1  
Old 03-31-2009, 05:17 PM
law32ps87 law32ps87 is offline
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oil for 87 prostar

I have been using rotella t for the 2 years I have owned the boat, but I remember reading somewhere that they stopped putting in an additive that is needed for the flat tappet cam in my engine. Im not entirely sure if this is true, but what engine oil would be best for my engine? 351 indmar, non powerslot
thanks
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  #2  
Old 03-31-2009, 07:09 PM
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Laurel_Lake_Skier Laurel_Lake_Skier is offline
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If you want to stick to a multi, Valvoline VR1 20W-50 seems to be the current best choice. It has the high level of ZDDP you need for the flat tappet engine. The Rotella still has the ZDDP in the straight 30 and 40 weights as well. For a very complete discussion, check out CorrectCraftFan.com and do a search for either the VR1, Rotella or ZDDP oil.....lots of tech talk over there.
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Old 04-01-2009, 12:45 PM
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east tx skier east tx skier is offline
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I'm close to your latitude and run the 20W50 VR1. But given our temperatures in Texas, you'd probably be fine with the straight 40 as well.
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Old 04-01-2009, 01:09 PM
TMCNo1 TMCNo1 is offline
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I've always run Valvoline VR1 40 weight in our '89,
Attachment 45674
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  #5  
Old 04-01-2009, 01:45 PM
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loeweb loeweb is offline
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Quote:
Originally Posted by TMCNo1 View Post
I've always run Valvoline VR1 40 weight in our '89,
Attachment 45674
Stupid question but what is the difference between the straight 40wt and the 20w 50 VR1?
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Old 04-01-2009, 02:24 PM
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east tx skier east tx skier is offline
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Stupid question but what is the difference between the straight 40wt and the 20w 50 VR1?
I'm not an oil expert, but the the multiweight oils are going to help you with lubrication at startup. Whether or not you can get away with using straight 40W oil is going to depend on how cold it gets when and where you're operating.
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  #7  
Old 04-01-2009, 02:25 PM
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loeweb loeweb is offline
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Quote:
Originally Posted by east tx skier View Post
I'm not an oil expert, but the the multiweight oils are going to help you with lubrication at startup. Whether or not you can get away with using straight 40W oil is going to depend on how cold it gets when and where you're operating.
Thanks for the clarity. I better use the vr1 20w 50 here in the midwest.
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  #8  
Old 10-28-2009, 08:28 PM
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wakesurfer wakesurfer is offline
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Thanks that link was full of good opinions, anyone heard of Royal purple? hows that stuff, I heard that Amsoil is more expensive but good, its almost $10 a quart in that neighborhood.
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  #9  
Old 11-16-2009, 08:16 PM
erie X5 erie X5 is offline
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I put pennzoil 5w-20 synthetic in my indmar 310 is this ok
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  #10  
Old 11-20-2009, 11:16 PM
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deereman deereman is offline
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Boat: 1987 Mastercraft Prostar 190 Powerslot 351 Ford
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we run amsoil synthetic in our 87, and also in our utility tractor and vehicles. it's a very good quality oil.
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