Recent Topics
microguard new style, 3k- 6 month oil change ?
by MetalSlug
2 minutes 57 seconds ago
Renting house out with marketplace homes?
by jay929
31 minutes 0 seconds ago
Lower MPG after synthetic switch
by BrandonVA
33 minutes 19 seconds ago
drive once in a few month oil change question .
by MetalSlug
35 minutes 55 seconds ago
Leaking Dry Cell Batteries - Any that Don't Leak?
by ZeeOSix
Today at 10:09 PM
Why no 0W/30?
by otis24
Today at 10:06 PM
Price of Fram Ultra????
by Hot_Ajax
Today at 10:01 PM
Tires for the Ody
by SF0059
Today at 09:34 PM
Smith and Wesson M&P AR-15 Sport
by HM12460
Today at 09:14 PM
Armor Ultra Shine Wash and Wax (64 oz) for $3.82
by Tony_Mack
Today at 09:05 PM
See they can get along...
by ls1mike
Today at 08:59 PM
Accu-Gage Tire Gauge $3.99 Sears
by Warstud
Today at 08:12 PM
Newest Members
MikeF, jim1224, Wompem, Dlauth, ToddT58
51371 Registered Users
Who's Online
68 registered (901Memphis, ag_ghost, 1kickbuttranger, 2KBMW, 01rangerxl, 5 invisible), 1364 Guests and 214 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51371 Members
64 Forums
219606 Topics
3466116 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 2 of 3 < 1 2 3 >
Topic Options
#3256405 - 01/22/14 02:53 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 14774
Loc: Sunny Florida
a water to water heat exchanger is awfully effective. Any normal water temp at the inlet under 100 degrees is likely to keep that engine mega cool and require the Tstat to force it to full temp whatever that is.
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix

Top
#3256881 - 01/22/14 09:57 PM Re: mercrusier oil for HOT temps [Re: SteveSRT8]
Too_many_Cars Offline


Registered: 11/06/13
Posts: 41
Loc: Ohio
Our BB's run around 190 deg. In the spring when Lake Erie is COLD we run 170 to 180. I have also have great luck with Merc full syn. We take them apart about every 5 years. The girls look great. We will do the lowers in 2015. Twin 454 Mags blush we like to let them eat at 5500. I know..... Not good for mileage and motors..... But, we love the speed. 80's on the water is crazy in a v bottom. The old Formula is a 2000. Will try to post a photo. Can burn 100 gal quick. It is worse than a bad habit. Heck it is!!! Don't give me too much heck, but we love the speed and sound of this boat. Purchased new. A one owner.
_________________________
2000 Formula 312 twin 454's. Synthetic MerC 25W-40
2014 Durango.
2010 Mini Cooper JCW. M1 5w20
2011 Jaguar XJL. Castrol SLX 5w20
Plus a few more.

Top
#3256886 - 01/22/14 10:05 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Too_many_Cars Offline


Registered: 11/06/13
Posts: 41
Loc: Ohio
Btw. It is 4 deg at Catawba Island Ohio. Lake Erie had the most ice on her in 20 years. Average of 4 in. We came up to check our house. We watched two Chevy pickups go out on the ice. That takes some stones! Not me. I like water that moves and above 60 deg. We were so flabbergasted I forgot to take a photo.
_________________________
2000 Formula 312 twin 454's. Synthetic MerC 25W-40
2014 Durango.
2010 Mini Cooper JCW. M1 5w20
2011 Jaguar XJL. Castrol SLX 5w20
Plus a few more.

Top
#3257046 - 01/23/14 05:34 AM Re: mercrusier oil for HOT temps [Re: leroyd92]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 14774
Loc: Sunny Florida
My go-fast sliver has a 572 with a little boost thrown in for about 850 hp at the crank. It can really drink the go juice at higher throttle openings but there are few places where it's right for triple digit speeds!

I have a rev limiter that shuts down the fun at 6800 rpm, but my builder swears it would run 7200 all day long.

Engine temps are never over 190 no matter what, I use a tiny little heat exchanger from a Cat diesel catalog...
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix

Top
#3259089 - 01/24/14 09:43 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Too_many_Cars Offline


Registered: 11/06/13
Posts: 41
Loc: Ohio
I may be to old for triple digits, but still like the speed. Sounds like a great toy! Love the sounds from the BB large HP.
_________________________
2000 Formula 312 twin 454's. Synthetic MerC 25W-40
2014 Durango.
2010 Mini Cooper JCW. M1 5w20
2011 Jaguar XJL. Castrol SLX 5w20
Plus a few more.

Top
#3283592 - 02/15/14 10:17 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Bror Jace Offline


Registered: 05/27/02
Posts: 4864
Loc: Saratoga, NY
"Any name brand 15w40 should fit the bill. No reason to use 20w50 over 15w40 unless your trying to slow consumption. The engine obviously has a large range for oil choices. 15w40 is just so stout and readily available it's hard to ignore."

+1

Any of the major 15W40 oils (Delo, Delvac, Pennz Long-Life, etc.) are real champs in these kinds of applications. Readily available, affordable, shear stable and with an almost-ideal additive package for dealing with moisture and other contaminants getting into the oil.

To be more specific, with marine engines you have a high-moisture environment. Moisture + byproducts of combustion = acids attacking the engine. HDEO oils have the best add-packs to combat this.

20W50 are usually not as shear stable and don't have nearly the add-pack. It won't thin out to a 30 weight or below ... but all that VII that's broken down could form sludge. It certainly isn't helping protect your engine.

I don't know enough about Mercruiser's 25W40 oils. However, I have yet to see a manufacturer-branded oil that impresses ... and I'm talking about any internal combustion engine application on land, in the water or air. You typically get a higher price but mediocre-at-best performance.
_________________________
--- Bror Jace
2006 Honda Civic
2005 Honda S2000

Top
#3284711 - 02/16/14 10:57 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Bror Jace Offline


Registered: 05/27/02
Posts: 4864
Loc: Saratoga, NY
Tractor & Supply has Shell Rotella 15W-40 at 2.5 gallons for $30. Hard to beat that! Price is good from now until April.

On the same shelf they had Mystick 15W-40 semi-synthetic This whole class of oils (15W-40 HDEOs) is filled with winners.

Just be sure they say SL, SM or SN on the bottle. That means these oils are approved for gasoline engines as well as diesels. There are a few diesel-only HDEOs out there. But, they will be hard to find, especially in mass-market outlets.

What is the creme de la creme of this class of oils? Probably this one:

http://www.schaefferoil.com/supreme-7000-engine-oil.html

Good luck shearing that down with anything short of a jet turbine. grin
_________________________
--- Bror Jace
2006 Honda Civic
2005 Honda S2000

Top
#3285944 - 02/18/14 07:33 AM Re: mercrusier oil for HOT temps [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 233
Loc: AZ
I have rotella in both my boats and my Harley. Soon to go into my 190cc pressure washer and rotella 1030 in the trucks once its time for change.

Top
#3285954 - 02/18/14 07:41 AM Re: mercrusier oil for HOT temps [Re: leroyd92]
leroyd92 Offline


Registered: 01/21/14
Posts: 233
Loc: AZ
I met a gent yesterday at terribles who had a 98evo with 198xxx on the ticker. Original owner, never taken to a shop, daily rider for the last 16years...

I asked him what oil he used and he said ( tech 2050 )

I said (WalMart supertech ?) he said Yeppp!!! And a filter that fits an R22 motor, usually fram... changed at 2000/3000 since I only have 2QUARTS in the bike.


IM starting to realize the saying (routine maintenance is better then routine neglect )

Top
#3285965 - 02/18/14 07:57 AM Re: mercrusier oil for HOT temps [Re: leroyd92]
Clevy Offline


Registered: 11/11/10
Posts: 7211
Loc: Saskatoon canada
Originally Posted By: leroyd92
When we say 1540are we talking about diesel rated oil or regular gasser oil?

I ask, because I've seen diesel oils are rated differently.

And you said stout??? Does 1540 have a high shear resistance ???


Yes. Conventional 15w-40 diesel/dual rated oils tend to be very shear resistant. In my shared sump bikes I've ridden over 5000 miles on rotella t 15w-40 before the too end got noisy. Typical mc synthetic 10w-40s get noisy at 2500 or so. The extra noise is due to shear.
Hdeo's are great oils for bikes. I'm using rotella t in my Harley right now.
_________________________
2006 Charger RT
Miles x 2 per oil filter

Top
#3305887 - 03/09/14 03:16 AM Re: mercrusier oil for HOT temps [Re: leroyd92]
lars11 Offline


Registered: 12/16/06
Posts: 711
Loc: Sweden
Don't think you have to worry about air temps at all. Boats have unlimited amounts of cooling water and unless something is wrong, you will get your 185-195 temp regardless.
However, under load, local parts in engine may be very hot and there may be some gas contamination of you oil.

What I see in manuals is the following:
Straigt 30 synthetic (Volvo/Merc)
15w50 mineral or synthetic (Volvo)
20w50 (Volvo)
25w40 (merc)

Not common in manuals at least:
Lots of users running HDEO 15w40

Have been running 15w40 Delvac MX for a while now, switching to 20w50 for this summer to test hot pressure.

Top
#3306410 - 03/09/14 06:45 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Donald Offline


Registered: 03/21/04
Posts: 13468
Loc: Upstate NY
I run Rotella T 15W40. Mercruiser 5.7L
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

Top
#3306561 - 03/09/14 09:39 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Bror Jace Offline


Registered: 05/27/02
Posts: 4864
Loc: Saratoga, NY
Straight 30 synthetic (Volvo/Merc)
15w50 mineral or synthetic (Volvo)
20w50 (Volvo)
25w40 (Merc)


lars11, that's quite the cast of characters you got there. A 30, 40 and two 50 weights (all at operating temp). You might want to start narrowing them down by determining what weight you want once the motor gets warmed up.

A 25w40 should be more shear stable than a 15W40 ... but you might want to look at some UOAs to confirm this ... I thought I heard someone here say the Merc 25w40 is shear prone.

The 20w50 is a marine oil? I wouldn't use a PCMO 20w50 in a marine application. I question it's shear stability as well as it's additive package. How will it handle fuel dilution + moisture?

It's hard to beat one of the many 15w40s available worldwide for shear stability and add-pack.
_________________________
--- Bror Jace
2006 Honda Civic
2005 Honda S2000

Top
#3306571 - 03/09/14 09:48 PM Re: mercrusier oil for HOT temps [Re: Bror Jace]
Ramblejam Online   content


Registered: 11/05/13
Posts: 919
Loc: Kentucky
Originally Posted By: Bror Jace
It's hard to beat one of the many 15w40s available worldwide for shear stability and add-pack.


On the "thin as possible, thick as necessary" front: http://www.amsoil.com/shop/by-product/mo...duty-motor-oil/

Top
#3307491 - 03/10/14 05:55 PM Re: mercrusier oil for HOT temps [Re: leroyd92]
Bror Jace Offline


Registered: 05/27/02
Posts: 4864
Loc: Saratoga, NY
"On the "thin as possible, thick as necessary" front ..."

If that's the way you roll, just about every major blender that puts out a 15W40 HDEO, puts out a companion HDEO in 10W30.

But if you start with a 10W30, and it shears/fuel-dilutes down to a 20 weight, you may experience accelerated wear when pushing the boat hard. Just food for thought ...
_________________________
--- Bror Jace
2006 Honda Civic
2005 Honda S2000

Top
Page 2 of 3 < 1 2 3 >