Of course it depends on the engine and the oil specified by the engine manufacturer, but Tesco's cheapest mineral diesel oil actually exceeds the oil specification for my Volvo 2003 - and it doesn't cost £40 for 4l! Oil to the specification stipulated in the manual is no longer available, so the next specification up is the best we can do.Yes it's a mineral oil but there are cheaper mineral oils around, your engine probably doesn't need GTX but it won't be harmed by it.
It is also probable the brother-in-law did not know what he needed, since "mineral oil" is not a specification. For example, if it was mineral oil he needed, it could not carry a multi-vis specification (15/40). That requires VI improvers. There is no such thing as 15/40 mineral oil.View attachment 181350
Any one tell me if this expensive oil is mineral oil? Asked my brother in law to bring some 15/40 mineral oil and he spent £40 on this.
I think you will find that Castrol market it as mineral oil based.It is also probable the brother-in-law did not know what he needed, since "mineral oil" is not a specification. For example, if it was mineral oil he needed, it could not carry a multi-vis specification (15/40). That requires VI improvers. There is no such thing as 15/40 mineral oil.
Nice to know, thanksOf course it depends on the engine and the oil specified by the engine manufacturer, but Tesco's cheapest mineral diesel oil actually exceeds the oil specification for my Volvo 2003 - and it doesn't cost £40 for 4l! Oil to the specification stipulated in the manual is no longer available, so the next specification up is the best we can do.
It is also probable the brother-in-law did not know what he needed, since "mineral oil" is not a specification. For example, if it was mineral oil he needed, it could not carry a multi-vis specification (15/40). That requires VI improvers. There is no such thing as 15/40 mineral oil.
Yes. But multi-grade is not just "mineral oil." Funny. But I believe you are correct.Oh dear. I'll guess the OP('s bother-in-law) wanted "mineral oil" i.e. good old fashioned multi-grade, as opposed to synthetic.
Yes but it is a basic mineral oil with as you have pointed out extenders / improvers to extend the viscosity range and also stabilise it through temperature changes. In the end it's a mineral oil.Yes. But multi-grade is not just "mineral oil." Funny. But I believe you are correct.
I can confirm that in the UK supermarket Tesco sell 15/40 own brand oil marked "mineral oil".It is also probable the brother-in-law did not know what he needed, since "mineral oil" is not a specification. For example, if it was mineral oil he needed, it could not carry a multi-vis specification (15/40). That requires VI improvers. There is no such thing as 15/40 mineral oil.
More importantly, the recommended grade for the Volvo 2003 is CD according to the owner's manual. CD is no longer readily available (it is an obsolete specification), but the Tesco oil is one step up (CF, I think, but I can't check), and is the appropriate replacement for CD.I can confirm that in the UK supermarket Tesco sell 15/40 own brand oil marked "mineral oil".
I'm not an expert and Beith is my brother in law but both have boats which use 15/40 mineral oil. I do hope we haven't been using the wrong stuff for all these years![]()
If it's anything like the Tesco oil, it's in small print on the label on the back of the container.what do Castrol know.
I suspect they know it doesn't meet an API CI spec, like for example Yanmar's own label oil does, or they'd list it on the label?