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Oil Question???

 
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chawk610
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PostPosted: May 26, 2011 1:18 pm    Post subject: Oil Question??? Reply with quote

Since my '83 MC Stars / Stripes has a FORD 351W in it... can I use standard oil when I change? I have been told to use 15w40... but that is deisel oil... seems too heavy to me.

Thanks.
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kartman
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PostPosted: May 26, 2011 4:09 pm    Post subject: Reply with quote

you would be fine with that. personally i run 10-30 in a 350 mag mpi.
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chawk610
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PostPosted: May 26, 2011 6:46 pm    Post subject: Reply with quote

Good... was thinking so... thanks!
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pet575
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PostPosted: May 27, 2011 6:28 am    Post subject: Reply with quote

kartman wrote:
you would be fine with that. personally i run 10-30 in a 350 mag mpi.


I run a 25W40 synthetic blend in mine. Why? Because that is what the owners manual says is the preferred weight. It also says that 10W30 will work if need be. I try to stick to the heavier weight synthetic blends in mine but to each his own. kartman knows a helluva lot more about engines than I do so I'm sure he's got sound reasons for using 10W30.

I've read countless threads on the interwebs and the only thing I've seen them agree on is that you should avoid a multi-viscous oil if possible. Otherwise, put whatever kind of oil in it you can find on the shelf of a local auto parts store.

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9DROZD
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PostPosted: May 27, 2011 5:24 pm    Post subject: Reply with quote

We run straight 40w oil in all our boats that we run through our shop, and all of our personal boats as well. The reason you should stay away from a multi weight oil is because a boat motor never builds up that much heat and you need the oil pressure.
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Wheeler
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PostPosted: May 28, 2011 4:44 am    Post subject: Reply with quote

I always run straight 30w or 40w in my boat. The multi-viscosity oils were developed for starting an engine and running at cold temperatures. I never run mine at 30 degrees.

The real problem with an older boat like yours (and mine) is the flat tappet cam. It requires Zinc Phosphate (ZDDP) to survive. There has been a reduced amount of this in oil for about the past 10 years. It harms O2 sensors. It may bite you, it may not. I have found that the straight weight diesel/tractor oils have it. You can tell from the label, it will say something like "for 2002 and earlier".

I just buy it in the 5 gal bucket because I have several classic cars that have the same problem.

Google search this and you will find a lot of info.
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chawk610
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PostPosted: May 31, 2011 3:25 am    Post subject: Reply with quote

Ok... thanks for the input yall!!!
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Commodore
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PostPosted: May 31, 2011 5:55 am    Post subject: Reply with quote

Wheeler wrote:
I always run straight 30w or 40w in my boat. The multi-viscosity oils were developed for starting an engine and running at cold temperatures. I never run mine at 30 degrees.

The real problem with an older boat like yours (and mine) is the flat tappet cam. It requires Zinc Phosphate (ZDDP) to survive. There has been a reduced amount of this in oil for about the past 10 years. It harms O2 sensors. It may bite you, it may not. I have found that the straight weight diesel/tractor oils have it. You can tell from the label, it will say something like "for 2002 and earlier".

I just buy it in the 5 gal bucket because I have several classic cars that have the same problem.

Google search this and you will find a lot of info.


Bingo. Older boats do not need a low temperature weight. I've run 40w in all my older Supras. It takes care of the cam, and also ensure that those older boats get a good lubrication even if there is a little bit of blow-by.
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