Which oil for a 1991 Mercruiser 4.3LX?

[fishingdan]

Anyone know what weight oil should be used in one of these engines?

Thanks,
Dan

 

[JustJason]

Re: Which oil for a 1991 Mercruiser 4.3LX?

yep.... the recommended weight is 25w-40...... as per mercruiser.
although.... any good name quality oil is fine. 10-30 10-40 20-40... it's all good. just keep an eye on the level.

 

[mthieme]

Re: Which oil for a 1991 Mercruiser 4.3LX?

I run Wally World 30HD in my (OMC) 4.3...motor has been in the boat 20 years, has thousands of hours on it and never been apart...still running fine.

 

[mthieme]

Re: Which oil for a 1991 Mercruiser 4.3LX?

I run Wally World 30HD in my (OMC) 4.3...motor has been in the boat 20 years, has thousands of hours on it and never been apart...still running fine.
see sig pic taken this summer

 

[Chris1956]

Re: Which oil for a 1991 Mercruiser 4.3LX?

Dan, MerCruiser has always recommended Automotive straight weight oil (SAE 30 or SAE 40) or their own multiweight oil (Quicksilver 25W-40). They have never recommended automotive multi weight oil. Lots of folks claim to use it w/o a problem, however I would never take that chance.

I always used the Quicksilver 25W-40 oil.

 

[achris]

Re: Which oil for a 1991 Mercruiser 4.3LX?

And I use 15W-40 Diesel engine oil.

 

[Fishermark]

Re: Which oil for a 1991 Mercruiser 4.3LX?

From Mercruiser:

 

[180shabah]

Re: Which oil for a 1991 Mercruiser 4.3LX?

OIL THREAD!!!!

Search oil - you can read for days

 

[achris]

Re: Which oil for a 1991 Mercruiser 4.3LX?

OIL THREAD!!!!

Search oil - you can read for days

And don't we love 'em!!!

 

[fishingdan]

Re: Which oil for a 1991 Mercruiser 4.3LX?

Thanks folks.