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Old 07-02-2009, 07:05 PM   #1
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502 MPI Recommended Oil Weight?
What is the recommended oil weight for a gen VI 502 MPI? And any recommendations on brand?

I used to run Valvoline Racing 40W a few years back. Is this still a good choice?
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Old 07-02-2009, 08:35 PM   #2
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I am sure that the Valvoline 40W is fine. I have always only used the Merc 25-40 in my 502 mpi, never had any issues with it yet.
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Old 07-02-2009, 10:31 PM   #3
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The 502's always had a tendency to burn a little oil. Actually the tolerances allowed it to blow bye especially when cold. I had the best luck with the straight Valvoline 40 weight racing oil. It is a good oil for that engine.
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Old 07-03-2009, 02:39 AM   #4
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I run Mobil 1 15-50 in mine.
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Old 07-03-2009, 08:15 AM   #5
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I run amsoil 10-40 in my past 502's
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Old 07-04-2009, 07:04 AM   #6
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Old 07-04-2009, 08:54 AM   #7
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Wow, lots of choices. Thanks for the info!
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Old 07-04-2009, 12:02 PM   #8
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Old 07-04-2009, 12:06 PM   #9
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I would recommend the Amsoil 10/40 or 20/50 for your application. I run the 10/40 in my 500EFI and am really happy with it so far.
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Old 07-04-2009, 09:09 PM   #10
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Originally Posted by Racerngr1 View Post
I would recommend the Amsoil 10/40 or 20/50 for your application. I run the 10/40 in my 500EFI and am really happy with it so far.
Amsoil's 40wt Marine is a 15W-40....

10W-40 would not do it I think.
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