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I wanted to change my oil before haul out. I have some questions. How many litres/gallons per 5.7 engine do I need to get? Can I use 10W30 car synthetic? Does using a brand like Royal Purple, Amsoil, or Mobil1 make a difference? Thanks ahead of time.

Shaun

As I work for one of Australia's largest Oil Blenders, yes, I am certain.

Like conventional automotive greases compared to marine designated greases, the anti-oxidant levels are much higher for marine.
'NMMA FC-W' is the international specification for Marine lubrication and all approved/ licenced products endure strict longevity testing against both wear & anti-corrosion...

I keep finding the dipsticks out of their tubes 3-4" :shock:

I have used straight 30,40 (Chevron Delo 400) and the Merc 35/40. All worked well with good oil pressures but I feel the additive pack in the Merc oil is best if you have a boat under warrantee. Dipsticks coming out of the tube suggests vibration or a loose locating bracket.

.................... or internal crankcase pressure due to piston ring blow by, maybe the PCV not venting air through properly.; the dipsticks fit pretty snugly in the tubes so if there is any pressure in there that can't get out any other way, I could imagine they could be pushed out ( not due to any oil pressure theough)..

Author:	318boating [ Tue Sep 10, 2013 10:27 pm ]
Post subject:	Engine oil
I wanted to change my oil before haul out. I have some questions. How many litres/gallons per 5.7 engine do I need to get? Can I use 10W30 car synthetic? Does using a brand like Royal Purple, Amsoil, or Mobil1 make a difference? Thanks ahead of time. Shaun

Author:	rpengr [ Tue Sep 10, 2013 10:40 pm ]
Post subject:	Re: Engine oil
318boating wrote: I wanted to change my oil before haul out. I have some questions. How many litres/gallons per 5.7 engine do I need to get? Can I use 10W30 car synthetic? Does using a brand like Royal Purple, Amsoil, or Mobil1 make a difference? Thanks ahead of time. Shaun Approx 4.5 quarts. 10W30...NO....Much to thin for a hard working marine engine. Straight 30 minimum (or even 40weight for Hot Climates). Also, deafwish has recently pointed out that the marine oils have more anti-oxidents deafwish wrote: As I work for one of Australia's largest Oil Blenders, yes, I am certain. Like conventional automotive greases compared to marine designated greases, the anti-oxidant levels are much higher for marine. 'NMMA FC-W' is the international specification for Marine lubrication and all approved/ licenced products endure strict longevity testing against both wear & anti-corrosion... Organic oil should be changed every year. Synthetic can go up to two years, but many people on this forum change every year anyway.

Author:	rpengr [ Wed Sep 11, 2013 7:01 am ]
Post subject:	Re: Engine oil
More discussion going on about oil (marine vs automotive) here: viewtopic.php?f=11&t=12269&p=115315#p115315

Author:	deafwish [ Wed Sep 11, 2013 7:58 am ]
Post subject:	Re: Engine oil
For the record, a 10w30 will have the same operating viscosity (100C) as a mono grade 30. Both of which are questionably too thin for most Chev based marine blocks. I would be far more confident in running something along the lines of a 15w50 or a 20w60 with a late API spec'.

Author:	jsimon [ Wed Sep 11, 2013 8:22 am ]
Post subject:	Re: Engine oil
The standard Mercury Marine oil is 25-W40

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Author:	Technologic80 [ Wed Sep 11, 2013 8:27 am ]
Post subject:	Re: Engine oil
I run 15w40 and find my oil pressures to be too high, even with a fully warmed engine. The oil pressure gauges peg at 80psi on plane. 20-40psi at no wake speeds. I keep finding the dipsticks out of their tubes 3-4"

Author:	Paul I. [ Wed Sep 11, 2013 8:35 am ]
Post subject:	Re: Engine oil
I would at least use a 10-40w oil. Remember, boat engines work a lot harder. No coasting down hills for us.

Author:	TFD2001 [ Wed Sep 11, 2013 9:10 am ]
Post subject:	Re: Engine oil
I run 20w50 in mine, and have yet to see any negatives from it.. Have not seen the Oil Pressure run too high either... Only negative (not really) is you about have to shake it out of the quart like a Ketchup bottle... j/k

Author:	rpengr [ Wed Sep 11, 2013 10:28 am ]
Post subject:	Re: Engine oil
Technologic80 wrote: I keep finding the dipsticks out of their tubes 3-4" That would not have anything to do with oil pressure...there is zero oil pressure in the oil pan. There is only pressure in the internal pathways of pressurized oil in the engine. Your dipstick issue is most likely vibration.

Author:	LouC [ Wed Sep 11, 2013 11:37 am ]
Post subject:	Re: Engine oil
I have used straight 30,40 (Chevron Delo 400) and the Merc 35/40. All worked well with good oil pressures but I feel the additive pack in the Merc oil is best if you have a boat under warrantee. Dipsticks coming out of the tube suggests vibration or a loose locating bracket.

Author:	Technologic80 [ Wed Sep 11, 2013 11:45 am ]
Post subject:	Re: Engine oil
Ahhh Ok Ill check the dipsticks and maybe find a way to get them to stay in their tubes. Btw, was at O'Reilly and Walmart on my lunch hour today, there is a MIR $5 rebate for jugs of Shell Rotella T5/T6 synthetic or synthetic blend Heavy Duty motor oil (just were $21/each at WM, less $5 MIR = $16 for synthetic heavy duty motor oil!). It comes in 10w-30 and 15w-40, also I think a 5w-40. Even if you dont use this on your boat, if you have another vehicle that uses one of those grades, its a pretty good deal. Just a heads up. Personally, Im going to switch from 15w-40 to 10w-30 when I change the oil the end of this season. I think with the Michigan climate 10w-30 Rotella Heavy Duty oil will be just fine. Right now I use Mobil Delvac 15w-40 because it was on sale for $8 per jug after MIR last year.

Author:	Graham R [ Wed Sep 11, 2013 11:50 am ]
Post subject:	Re: Engine oil
LouC wrote: I have used straight 30,40 (Chevron Delo 400) and the Merc 35/40. All worked well with good oil pressures but I feel the additive pack in the Merc oil is best if you have a boat under warrantee. Dipsticks coming out of the tube suggests vibration or a loose locating bracket. .................... or internal crankcase pressure due to piston ring blow by, maybe the PCV not venting air through properly.; the dipsticks fit pretty snugly in the tubes so if there is any pressure in there that can't get out any other way, I could imagine they could be pushed out ( not due to any oil pressure theough)..

Author:	Graham R [ Wed Sep 11, 2013 1:05 pm ]
Post subject:	Re: Engine oil
Yeah, It probably isn't an issue with those engine hours. I do know that if I don't push the dipstick firmy home on my car, it'll move out an inch or so in normal driving ( the dipstick handle has an O ring which pretty much seals it in the dipstick tube).

Author:	Decision [ Wed Sep 11, 2013 1:36 pm ]
Post subject:	Re: Engine oil
I have used Mercury 25W40 oil in our last three boats that we have owned with 5.7 litre engines. I plan to purchase a couple gallon jugs of 25W40 in Michigan next week while attending the Metro Fall Boat Show over there. This Mercury oil is cheaper in the US as compared to here in Canada. Mike.

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