engine oil

[Ex-SolentBoy]

It's an earlier API spec SEE HERE

My reservations on all this oil is that it is a 15W40

The original spec is for an SAE 20 oil between 5C and 25 C ambient temperatures
And SAE 30 above 25C

By using a 15W40 you are using an oil which is effectively the same as an SAE 40 oil at operating temperature.

I'd be happier with a 10W/30

Thanks for the advice. What do you mean by "original spec"? Apologies if I have lost the thread here!

 

[Ex-SolentBoy]

Yes, Vyv tends to give good advice on this subject. The recommended oil for Kubota based Nanni engines is API CD SAE 15W40 (at least that is what the instruction manual says, so probably correct).

I too have a Kubota based Nanni. The puzzling thing is that it came with 2 documents - a user manual and a maintenance schedule.

One says use API CD 15W40, the other says API CF 15W40.

If the manufacturer isn't sure, how can we be?????

 

[VicS]

Thanks for the advice. What do you mean by "original spec"? Apologies if I have lost the thread here!

Ignore! I was getting confused by the thread hijacking/drift earlier concerning oil for a Bukh

 

[VicS]

I too have a Kubota based Nanni. The puzzling thing is that it came with 2 documents - a user manual and a maintenance schedule.

One says use API CD 15W40, the other says API CF 15W40.

If the manufacturer isn't sure, how can we be?????

I'd suspect one was written when CD was a current spec and the other after CF was introduced and CD became obsolete.

According to the API specs CF can be used in place of CD

 

[Ex-SolentBoy]

Many thanks. I shall ask no more oil questions today.

 

[chart5011]

Rimula R3 X is formulated for heavy duty applications, which means trucks, long distances, heavy loads, high temperatures. Not really a description of most yacht auxiliaries. A lesser oil would certainly be adequate for most ageing engines. At least 15W/40 viscosity to protect bearings with some wear. What API grade does your manual specify?

The manual says API CC. The Rimula R3 X seems to cover loads of API classifications but not CC. Having used it for 5 or 6 years it seems to do the job, but should I be concerned that it is not API CC?

Thanks