Oil questions

[ChromeDome]

From Volvo's workshop manual

Plain mineral oil 15/40. If buying in supermarket look for the one that is recommended for older diesel engines.

The current equivalent is CF spec. Halfords sell an oil to this spec 15w/40 labeled for "older diesel engines".

if you want to stick to single grade oil I think Morris Oil still sell it.

Lot's of good info, also the above statements. Might also be labelled for Vintage cars.

The API CD standard was introduced in 1955 for severe duty diesel engines, including turbo and Caterpillar Series 3, built before 1995. Equivalent to MIL-L-2104C. Now obsolete.
As the classifications are backwards compatible any diesel-rated engine oil with an API higher (alphabetically) than CD will be fine. Hence also the stated CF.

The viscosity 15W/40 is probably easy to get but isn't very crucial unless you use the engine in extreme temperatures.

 

[neilf39]

I find 15/40 mineral oil in Tescos every now and then so buy it when I see it. Last time was in the Durrington store near Worthing.

 

[Daydream believer]

Does at Ulting have what I need plus I can get filters as well
I hate going there, because being such a large store, I always spend more money on other stuff I never intended to buy

 

[vyv_cox]

Contaminated link

Not at all. Website is fully functional and widely used. Maybe a problem with your security settings?

 

[Daydream believer]

Not at all. Website is fully functional and widely used. Maybe a problem with your security settings?

Malware byes does not like it either

 

[Ammonite]

Semi synthetic is mineral oil with additions of synthetic, also hydrocarbon but with closer control of molecular length. The proportions of the two are not regulated.

Provided the viscosity and specification are suitable for your engine there is no problem with using it. Many engine manuals still call for API CD spec, which became obsolete in the early 1960s! I think that API CI-4 is an excellent modern substitute.

There's no mention of TBN on this thread. Some of the CI-4 oils are advertised as high TBN which from previous threads I took to be a bad thing when it came to older diesels.
Lucas Oil UK - 15W-40 Magnum High TBN CI-4 Oil

I've just gone with this for my MD2040
https://s3-eu-west-1.amazonaws.com/...875744&Signature=LHtIFukF6iPqkO6wrM0N09+4Gx4=

Is TBN still a concern?

 

[Plum]

Not at all. Website is fully functional and widely used. Maybe a problem with your security settings?

Yes, your website works well, thank you, although I do get a message saying it is not secure and not to enter any sensitive information but this is not a problem as I don't need to.

 

[vyv_cox]

There's no mention of TBN on this thread. Some of the CI-4 oils are advertised as high TBN which from previous threads I took to be a bad thing when it came to older diesels.
Lucas Oil UK - 15W-40 Magnum High TBN CI-4 Oil

I've just gone with this for my MD2040
https://s3-eu-west-1.amazonaws.com/storage.commaoil.com/files/products_masters/16237.pdf?response-content-disposition=attachment; filename="16237.pdf"&AWSAccessKeyId=AKIAJXQ2YUDI5JWFP3IQ&Expires=1699875744&Signature=LHtIFukF6iPqkO6wrM0N09+4Gx4=

Is TBN still a concern?

It depends what is meant by 'high TBN'. When I last checked API CI-4 the TBN was stated to be 8. I would not consider this to be high in a lubricant that has been designed for low-sulfur fuel. Some grades have TBN that is twice this level, which I would consider to be high.

 

[Ammonite]

It depends what is meant by 'high TBN'. When I last checked API CI-4 the TBN was stated to be 8. I would not consider this to be high in a lubricant that has been designed for low-sulfur fuel. Some grades have TBN that is twice this level, which I would consider to be high.

The Lucas one I linked to is 13. The Endura product referenced by another poster is 10.2. Both are CI-4
The CG version I've just used is 8.9 so I'm still a bit confused about what I should be using or whether it doesn't really matter as long as its 15w40 mineral oil. Historically I've always changed the oil at the end of each season prior to it being laid up for the winter after 50 - 100 hours

 

[chriswesterman]

Not suggesting this is better or worse than anything else, but just in case anyone wants to buy CD mineral oil (15W40 with TBN 6.51) it is still available in 20l quantities

Victory 15w40 Mineral Engine Oil API CD/SF, CCMC G2/D2

Spec sheet at : https://www.exol-lubricants.com/wp-content/uploads/2022/08/TDS-M016-Victory-15W40-Iss-2.pdf

 

[vyv_cox]

I have taken up the security issue with my provider. There is no input facility for any user, in which case the security function is immaterial. No risk to anybody.

The website is free to all users and costs me a considerable sum. Adding the secure function would cost a further £60 per year, which I cannot justify, so it will remain as it is. There is no risk to the user so I can only leave the decision up to you.