15W-40 oil is it multi purpose?

[crazy charlie]

I see a lot of 15w40 oil brands.rotella,delvac etc. .Plan on an oil change in my Mercruisers.All the 15w40 I have seen have "Diesel" on the label. Doesn't matter?? Charlie

 

[racerone]

Oil debates go on and on.----I would use 25W-40 as per Mercruiser manuals.

 

[crazy charlie]

Yes I appreciate your input however I am looking for an answer to using this oil (which states diesel) in place of something that does not state that ,

 

[crazy charlie]

Also Im not lookin to start ANOTHER oil thread. My bad ,I didn't realize..lol

 

[racerone]

Use----google----This question of diesel rated oil in a gas engine has been asked / explained before.

 

[nola mike]

Yes, diesel is fine, and preferred if you have a flat tappet engine

 

[jimmbo]

Yes I appreciate your input however I am looking for an answer to using this oil (which states diesel) in place of something that does not state that ,

But your Mind is made up to use it, and you are just looking for someone to agree with you

 

[racerone]

Well said ---Jimmbo

 

[Bondo]

I see a lot of 15w40 oil brands.rotella,delvac etc. .Plan on an oil change in my Mercruisers.All the 15w40 I have seen have "Diesel" on the label. Doesn't matter?? Charlie

Ayuh,..... That's all I've used for decades,....

 

[Scott Danforth]

the diesel motor needs of today are the same as the flat tappet gas motors of 30 years ago

i run 15W40 Rotella diesel in half the things that I own with pistons (boat included). the other half gets 0W-20 synthetic

 

[crazy charlie]

Thanks guys for the assurance that it will be fine for a non-diesel motor.I usually use sae 30 heavy duty straight weight oil but it is getting harder and harder to find and this 15w40 is available in abundance and brand variety.I will get on Wallyworld.com and have them deliver to my door in a day.Cant beat that thanks again Charlie

 

[Scott Danforth]

I have been buying the 2.5 gallon jugs from Amazon. https://www.amazon.com/Shell-Rotella-Protection-2-5-Gallon-Single-Pack/dp/B01LH7KPUY/

$42 for 2.5 gallons

 

[nola mike]

Delvac 1300 $35 at Wally world, still has an SN rating FWIW

 

[ScottinAZ]

the 15w-40 "diesel" oil is good in many things. I use it in the boat, and also in my motorcycle with a wet clutch. It has the zinc in there that many of the old engines need, and no excess friction modifiers to mess with wet clutches.

 

[crazy charlie]

Delvac 1300 $35 at Wally world, still has an SN rating FWIW

You must have got 2 gal size.I just ordered a gal of Delvac for $14.50

 

[nola mike]

You must have got 2 gal size.I just ordered a gal of Delvac for $14.50

Yeah 2.5 gal

 

[BillWilliams]

I also use Rotella 15w-40 in my boat engine.

 

[matt167]

Many diesel oils carry both an S rating for gas and a CJ rating for diesel.

 

[jimmbo]

I've used Volvo Synthetic and Royal Purple in my I/O, next change, will likely be VP Oil.

 

[BRICH1260]

I have used multi viscosity Rotella in my boat for years. You will be fine.