best oil to use
06-27-2019 | 08:04 AM
#31
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Joined: Oct 2010
Posts: 1,621
Likes: 402
From: Cheboygan, MI
Been running Amsoil 15w50 racing oil for 9 years and my oil cooler is small for my hp and when running wide open I'm running oil temps around 280. Talked to the Amsoil tech and they said it's not a problem, and based on how clean the oil comes out at the end of the season, I have to agree. When I drop to an idle after a hard run pressure drops to 15-20psi. By the time I get from the beginning of the no wake zone to the mouth of the river (about 200 yards) my oil temps are below 200 and the pressure is back to 40-50psi. My oil pressure is super stable, I boat in very cold water from 35 degrees up to 80 and my oil pressure doesn't vary much from cold start to 200. Best part is when I'm out on the lake in mid to late October when it's 40-50 degrees out it doesn't start any harder than when it's 90 out. I did a partial tear down a while back to do an inspection and everything looked new after a couple hundred hours of running.
07-03-2019 | 12:25 AM
#32
Registered
Joined: Apr 2017
Posts: 45
Likes: 0
From: CA
recommended motor oil
I use the manual, the recommended oil weight for merc is a 40 weight, multi viscosity or straight 40 weight. The chart also shows, your good for a straight weight in hotter weather. The ambient temp in AZ, is 110 on average.
Vr1 40 it is.
Vr1 40 it is.
04-10-2020 | 03:47 PM
#33
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Joined: Apr 2009
Posts: 286
Likes: 33
From: Lake Charles, La
Well thank you ThisIsLivin,
i've been looking a whole lot for someone that has been running higher oil temps with success.
I believe in running warmer than "normal" just to keep the oil drier from moisture..... and also to get rid of the remote oil adaptor, 3 hoses, remote filter mount, and of course the oil cooler. I want things simple and dependable, all that stuff gone. Less weight, more room, and less leak potential, more oil flow probably.
But my temps when i temporarily bypassed the cooler last summer ran 280 at cruising just under WOT, 4500 or so for a few minutes in 90 degree weather here on the Gulf Coast. So was nervious to do this but apparently you've had good success. I feel better now trying it. Haha.
I've got twin 1998 502MPI's on a 32ft Sutphen modified only with advanced upper end timing to 36 degrees and Eddie Marine exhaust. These two things added 6-7 mph.
By the way i did just talk to a mechanic that took apart an old 305 on a cruiser that ran without an oil cooler for years probably at 3/4 or more throttle and 275plus oil temps. said the cleanest motor he's taken apart.
i've been looking a whole lot for someone that has been running higher oil temps with success.
I believe in running warmer than "normal" just to keep the oil drier from moisture..... and also to get rid of the remote oil adaptor, 3 hoses, remote filter mount, and of course the oil cooler. I want things simple and dependable, all that stuff gone. Less weight, more room, and less leak potential, more oil flow probably.
But my temps when i temporarily bypassed the cooler last summer ran 280 at cruising just under WOT, 4500 or so for a few minutes in 90 degree weather here on the Gulf Coast. So was nervious to do this but apparently you've had good success. I feel better now trying it. Haha.
I've got twin 1998 502MPI's on a 32ft Sutphen modified only with advanced upper end timing to 36 degrees and Eddie Marine exhaust. These two things added 6-7 mph.
By the way i did just talk to a mechanic that took apart an old 305 on a cruiser that ran without an oil cooler for years probably at 3/4 or more throttle and 275plus oil temps. said the cleanest motor he's taken apart.
