Oil Change

[Outnumbered]

Probably asked here 1000 times but I can't find a thread using search:loser:

So, help me out.

1990 carbed 5.7 Mercruiser Bluewater Inboard (whatever that is). All stock in a direct drive ski boat.

I'm guessing 5 quarts?

Do I need to use Merc oil (Merc website says 25W-40) or can I run Delo or some other easily found oil?

Thanks

 

[H20-ski]

I have a 1995 Malibu Merc 5.7.

Owners manual says straight 40w or 30 depending on outside temp.
States do not use multi viscocity oils. Doesn't explain why, maybe foaming.

So I run Valvoline Racing 40w. Straight.

 

[Outnumbered]

I have a 1995 Malibu Merc 5.7.

Owners manual says straight 40w or 30 depending on outside temp.
States do not use multi viscocity oils. Doesn't explain why, maybe foaming.

So I run Valvoline Racing 40w. Straight.

Thanks, this is what Mercury says...

Engine Oil
For optimum engine performance and maximum protection, use the following oil:
Application Recommended Oil All MerCruiser engines Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMC FC-W rated IMPORTANT: Lubrication requirements for catalyzed engines differ from the requirements for non-catalyzed engines. Some marine-grade lubricants contain high levels of phosphorus, which can damage the catalyst system on MerCruiser engines. Although these high-phosphorus lubricants may allow acceptable engine performance, exposure over time will damage the catalyst. Catalysts damaged by lubricants containing high levels of phosphorus may not be covered by the MerCruiser Limited Warranty.
If Mercury MerCruiser Full-Synthetic, 20W-40 oils is unavailable, use the following lubricants, listed in order of recommendation. If you are servicing a catalyst engine, use these for short periods of time only.

1. Mercury/Quicksilver 25W-40 Synthetic Blend, NMMA FC-W-rated 4-cycle MerCruiser oil
2. Mercury/Quicksilver 25W-40, NMMA FC-W-rated 4-cycle MerCruiser oil
3. Other recognized brands of NMMA FC-W-rated 4-cycle oils
4. A good-grade, straight-weight detergent automotive oil according to the last row of the operating chart below.

NOTE: We do not recommend non-detergent oils, multi-viscosity oils (other than as specified), non-FC-W-rated synthetic oils, low-quality oils, or oils that contain solid additives.

 

[Riverbound]

If you care about your boat. Run Lucas marine oils. In our supra we run 25/40 high zinc. If its a catalytic converter boat do NOT run high zinc products. We have an alternative for that. All of the lucas oils meet and or exceed the specs put in place by all marine manufacturers.

 

[HolyMoly]

WTF? You never heard of Lucas?

 

[H20-ski]

Ok I'm at home now owners manual in front of me.

CRANKCASE OIL

To obtain optimum engine performance and to provide maximum protection,we strongly recommend the use of Quicksilver 4-cycle Marine Engine Oil.
If not available, a good grade, straight weight, detergent automotive oil of correct viscosity, with an API classification of SG/CD 11, may be used.

In those areas where recommended straight weight oil is not available, a multi-viscosity 20W-40 (SG/CD 11) may be used.

IMPORTANT: The use of non-detergent oils, multiviscosity oils (other than 20W-40 or 20W-50), low quality oils or oils which contain solid additives specifically are not recommended.

Air temp.
Up to 32F 20W

32F to 50F 30W

50 on up 40W.

Not much different than above post.

That being said I run straight 40w Valvoline Racing oil. :thumbsup
People who know use Valvoline.

 

[Faceaz]

Hate to admit I know this & I've been in there, but Walmart :skull, carries Quicksilver. The only thing I go there for, since West Marine bends you over so badly.

 

[H20-ski]

Hate to admit I know this & I've been in there, but Walmart :skull, carries Quicksilver. The only thing I go there for, since West Marine bends you over so badly.

So true. I seen that with a Google search, Walmart.

 

[brad22]

Hate to admit I know this & I've been in there, but Walmart :skull, carries Quicksilver. The only thing I go there for, since West Marine bends you over so badly.

Pretty sure they care Lucas Products too?? :headscratch: Maybe just additives though not sure...

 

[Faceaz]

Pretty sure they care Lucas Products too?? :headscratch: Maybe just additives though not sure...

Absolutely no idea. I know Lucas is good, but I've had great experience with Quicksilver & if it's what's spec'd, I would be running it.

 

[Outnumbered]

Thanks all:thumbsup

 

[H20-ski]

Probably asked here 1000 times but I can't find a thread using search:loser:

So, help me out.

1990 carbed 5.7 Mercruiser Bluewater Inboard (whatever that is). All stock in a direct drive ski boat.

I'm guessing 5 quarts?

Do I need to use Merc oil (Merc website says 25W-40) or can I run Delo or some other easily found oil?

Thanks

Change the trans fluid also. Just did mine last night. :hmm

 

[Ragged Edge]

Thanks, this is what Mercury says...

Engine Oil
For optimum engine performance and maximum protection, use the following oil:
Application Recommended Oil All MerCruiser engines Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMC FC-W rated IMPORTANT: Lubrication requirements for catalyzed engines differ from the requirements for non-catalyzed engines. Some marine-grade lubricants contain high levels of phosphorus, which can damage the catalyst system on MerCruiser engines. Although these high-phosphorus lubricants may allow acceptable engine performance, exposure over time will damage the catalyst. Catalysts damaged by lubricants containing high levels of phosphorus may not be covered by the MerCruiser Limited Warranty.
If Mercury MerCruiser Full-Synthetic, 20W-40 oils is unavailable, use the following lubricants, listed in order of recommendation. If you are servicing a catalyst engine, use these for short periods of time only.

1. Mercury/Quicksilver 25W-40 Synthetic Blend, NMMA FC-W-rated 4-cycle MerCruiser oil
2. Mercury/Quicksilver 25W-40, NMMA FC-W-rated 4-cycle MerCruiser oil
3. Other recognized brands of NMMA FC-W-rated 4-cycle oils
4. A good-grade, straight-weight detergent automotive oil according to the last row of the operating chart below.

NOTE: We do not recommend non-detergent oils, multi-viscosity oils (other than as specified), non-FC-W-rated synthetic oils, low-quality oils, or oils that contain solid additives.

What you are looking at is the current Merc specs for their marine engines that meet the new clean air standards and have a catalytic converter much like your car. Your 1990 Ski Supreme should not have a catalytic converter as the clean air standards for boats were not in place back then.

 

[wedge45]

And what's the recommendation for a Mercruiser 496 HO, Bravo 1X ....

 

[Outnumbered]

Got the Quicksilver 25w-40 at Walmart for $6 per quart. They also carry the Quicksilver fuel and oil filters . Also changed the atf in the velvet drive. She started right up. Good to go now., thanks

 

[Outnumbered]

What you are looking at is the current Merc specs for their marine engines that meet the new clean air standards and have a catalytic converter much like your car. Your 1990 Ski Supreme should not have a catalytic converter as the clean air standards for boats were not in place back then.

Actually not, if u read the whole thing it says it covers non cat engines too.