synthetic oil in 500EFI?
12-16-2012, 05:16 PM
#51
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12-16-2012, 05:28 PM
#52
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12-16-2012, 05:29 PM
#53
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If you buy Brad Penn, two or mores cases you will get a discount. Swepco you can if you work or own a shop you buy at wholesale. Joe Gibbs I have not found any breaks yet. Shop around on line, you usually can catch a deal.
12-16-2012, 09:12 PM
#54
So, I've always run Merc 25W-40 dino until last year switched to Merc 25W-40 semi-syn in all 3 current 4 cycle marine engines. Always changed at 50 hrs std duty engines and 25 hrs high perf engines. I've got 330 hrs on 05 525's, 180 hrs on an 07 current 350 MAG, had 225 hrs on 04 496's, and had 500 hrs on an old 87 350MAG before rebuilt for tuliped valve. I've had no oil related probs I know of or is ignorance bliss? What is "wrong" with the Merc oils? 
12-17-2012, 06:17 AM
#55
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So, I've always run Merc 25W-40 dino until last year switched to Merc 25W-40 semi-syn in all 3 current 4 cycle marine engines. Always changed at 50 hrs std duty engines and 25 hrs high perf engines. I've got 330 hrs on 05 525's, 180 hrs on an 07 current 350 MAG, had 225 hrs on 04 496's, and had 500 hrs on an old 87 350MAG before rebuilt for tuliped valve. I've had no oil related probs I know of or is ignorance bliss? What is "wrong" with the Merc oils?
12-17-2012, 06:47 AM
#56
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Brad Penn (bought Kendall oil back in the early 90's) then Joe Gibbs make a dino oil also. Both are some of the best oils produced. Kendall is also a great oil. Swepco 306 oil is also a awesome choice. All of these oils listed have a high zinc content and properties that you need in marine applications.
Most of these oils are about 8 dollars a quart. Better pricing if you buy cases or gallons.
Most of these oils are about 8 dollars a quart. Better pricing if you buy cases or gallons.
Ken
12-17-2012, 07:30 AM
#57
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What about breaking in a new motor, run conventional then change to synthetic, or break it in with the oil your gonna run
07-14-2016, 09:22 AM
#59
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sorry dude, but i know if you chose to ignore the people on this forum (ray) that make a living and stake their reputation on what they know and sell that is your prerogative. There is a reason that chevrolet chose to put synthetics in the corvette many many years ago. It is a know fact that synthetics perform better than conventional oils in all categories.
100% agree!
