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#4583766 - 11/24/17 03:09 PM Ski Boat Oil
Skier Offline


Registered: 11/22/17
Posts: 11
Loc: Ohio
Hi Guys, i have a stock 2002 Corvette LS1 in my ski boat with 460 hours - It's a beast. Since break in it's been ran with M1 15w50. I purchased the boat this spring and left the 15w50 in it since it was fresh, but felt it might be a little too thick of oil to run.

When i changed it this fall, I put in 15w40 dino (per the boat manual) . I actually noticed a slight improvement in acceleration - not sure if it was just in my head. There was no change in oil pressure going from the 15w50 to the 15w40. 35 PSI idle, 50 cruising and 60 wide open.

Anyhow, GM normally specs M1 5w30 for this engine in a car. I know the arguments for thicker oil in a boat due to higher RPM and loads on a boat and higher shear scenarios. But is that old school thinking ? I have read other views that i should be running thinner oil. Some of the newer boat engines are actually running this grade.

Probably just over thinking this but I plan to keep this boat for another 20 years. Thoughts ?

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#4583773 - 11/24/17 03:20 PM Re: Ski Boat Oil [Re: Skier]
Charlie2015 Offline


Registered: 04/24/15
Posts: 236
Loc: Georgia
Probably try some Mobil1 0w30 AFE
_________________________
1998 Honda Accord EX 2.3L Auto
2009 Scion TC Manual

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#4583780 - 11/24/17 03:46 PM Re: Ski Boat Oil [Re: Skier]
doyall Offline


Registered: 06/26/03
Posts: 493
Loc: LA (Lower Alabama)
If I was going with an xW-40 it would be synthetic (Delvac perhaps), not a conventional. If you only do 30 hours/year (your average), don't beat it hard the entire time and change it every year, the conventional shouldn't be a problem. Nor would M1 5W-30. FWIW, my 2007 5.0L GM Vortec (VolvoPenta) calls for xW-50 if Volvo's "special" synthetic SAE 30 mono is unavailable. I have just put 5W-40 Total Quartz Energy in it for next season as I had enough left over from a stash for a no-longer-owned vehicle. I typically use M1 15W-50 as it is the cheapest. I do about 30 - 40 hours a year as well with a good dose of skiing.

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#4583789 - 11/24/17 04:13 PM Re: Ski Boat Oil [Re: Skier]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
The car is different. Note that Vettes often call for a 15w-50 if being tracked. There's still nothing wrong with a higher HTHS oil for a boat. A monograde isn't even out of the question at all, simply because of the usage pattern. You're not using it below freezing, so the need for a monograde is minimised, and fuel economy considerations aren't the same.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4583821 - 11/24/17 04:42 PM Re: Ski Boat Oil [Re: Skier]
Skier Offline


Registered: 11/22/17
Posts: 11
Loc: Ohio
i actualy put 57 hours on it this year - crazy skier here - I'm gonna put around 60 hours a year.

I was planning to buy M1 5w40 turbo diesel but I ran into a crazy deal on Valvoline Premium Blue 15w40 that I couldn't pass up. 3.50 a gallon - so i bought a bunch.

when I changed the 15w50 at 57 hours it was definitely diluted and dirty so I think I'm going to change the oil every 30-40 hours. Sometimes we pull bare footers at a constant 5000 rpm so that is my only reservation with the 5w30. But then again it's what a corvette would normally run.

seems like 15w40 is the un-disputed holy grail of boat oil from all the boater dudes I talk to, but I like to challenge things. I must admit I'm new to the inboard boat thing - my previous boats had 2 stroke outboards.

Seems like the advantage of the 5w30 would be better cooling ?

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#4583862 - 11/24/17 05:29 PM Re: Ski Boat Oil [Re: Skier]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
I don't think you'd notice any significantly better temperatures with a thinner oil. If you were using a 5w-30, I'd hunt for an A3/B4 version first before slipping into ILSAC territory. The usage pattern on the boat will be significantly different than it will be for the average Vette, which probably rarely breaks the double nickel and runs on summer weekends only. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4583867 - 11/24/17 05:37 PM Re: Ski Boat Oil [Re: Skier]
Shannow Online   content


Registered: 12/12/02
Posts: 39820
Loc: 'Stralia
Look at the philosophy of Honda, who use the same basic engine for their cars and their outboards.

Car might well be specced for 0W20/5W20, but their outboards using the same basic engines call for a 10W30 that meets FC-W.

That spec calls for a post shear HTHS of 3.3

FC-W specs

So Honda are acknowledging that for the duty cycle of the same architecture in a boat, they want something more robust...

So I'd be reticent to run an ILSAC 5W30 in it (2.9-3.1 HTHS BEFORE use)...you could run 5W30/0W30 A3/B4, but they are pricey here.

10W30 FC-W would be OK, but marine oils aren't value for money.

I'd stick to the Premium blue if its there and good price.

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#4583871 - 11/24/17 05:43 PM Re: Ski Boat Oil [Re: Skier]
Donald Offline


Registered: 03/21/04
Posts: 20444
Loc: Upstate NY
Originally Posted By: Skier
i actualy put 57 hours on it this year - crazy skier here - I'm gonna put around 60 hours a year.

I was planning to buy M1 5w40 turbo diesel but I ran into a crazy deal on Valvoline Premium Blue 15w40 that I couldn't pass up. 3.50 a gallon - so i bought a bunch.

when I changed the 15w50 at 57 hours it was definitely diluted and dirty so I think I'm going to change the oil every 30-40 hours. Sometimes we pull bare footers at a constant 5000 rpm so that is my only reservation with the 5w30. But then again it's what a corvette would normally run.

seems like 15w40 is the un-disputed holy grail of boat oil from all the boater dudes I talk to, but I like to challenge things. I must admit I'm new to the inboard boat thing - my previous boats had 2 stroke outboards.

Seems like the advantage of the 5w30 would be better cooling ?







You cannot tell if it was diluted unless you do a UOA or there are a few more QTs in the pan than their should be and it's not water.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


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#4583874 - 11/24/17 05:44 PM Re: Ski Boat Oil [Re: Skier]
Donald Offline


Registered: 03/21/04
Posts: 20444
Loc: Upstate NY
I would consider Rotella T6.
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2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


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#4583902 - 11/24/17 06:18 PM Re: Ski Boat Oil [Re: Skier]
bubbatime Offline


Registered: 03/18/08
Posts: 5615
Loc: South Florida
Do NOT run 5W30 or 0W30 in it.

The premium blue you are running is a good oil.

Honestly, Mobil 15W50 is a really good oil and is ideal for your application.
_________________________
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4583909 - 11/24/17 06:32 PM Re: Ski Boat Oil [Re: Garak]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
The back of my Valvoline bottle says A3/B3-04. That's for the Synpower 5W-40.

I'm wondering if that passes Garak's specifications. smile

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#4584060 - 11/24/17 09:32 PM Re: Ski Boat Oil [Re: Merkava_4]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
Yes, that would work, I'd think. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4584078 - 11/24/17 10:04 PM Re: Ski Boat Oil [Re: Skier]
FastLane Offline


Registered: 12/10/14
Posts: 447
Loc: MB - Manitoba
I would use what your using. It’s great oil.
_________________________
2010 Silverado 4.8 4x4 Mobil 1 5W30 ACDelco PF48E
2002 Mustang GT 4.6 Mobil 1 5W30 MC FL-820S
1966 Cessna 150 Phillips 20W50
2013 Mercury 30hp Merc 10W30

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#4584167 - 11/25/17 05:13 AM Re: Ski Boat Oil [Re: Skier]
Silverado12 Offline


Registered: 02/26/13
Posts: 3110
Loc: Central Virginia
FWIW I use Delo 15W-40 in my 4.3 V-6 Chaparral.
_________________________
12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
16 Challenger R/T Shaker 5.7 manual B5 blue
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto

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#4584194 - 11/25/17 06:48 AM Re: Ski Boat Oil [Re: Skier]
doyall Offline


Registered: 06/26/03
Posts: 493
Loc: LA (Lower Alabama)
Originally Posted By: Skier
i actualy put 57 hours on it this year - crazy skier here - I'm gonna put around 60 hours a year. ... Sometimes we pull bare footers at a constant 5000 rpm so that is my only reservation with the 5w30.
...
Seems like the advantage of the 5w30 would be better cooling ?


Sounds like you may be a candidate for M1 V-Twin 20W-50. Stout stuff. Peruse the go-fast, be-loud boat forums and you will hear it mentioned a lot.

Cooling should not be an issue absent some other problem.

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