Which oil

I have rebuilt my series 3. But the engine is a metric 5mb 2.25 petrol.

I have put 20/50 oil in. But have been told it should be 15/40?

Anyone enlighten me please

15/40 full mineral

I will watch this with interest as I also have a 5mb all be it diesel and I run 20/50 in mine.

20/50 is really for tired old lumps, though I cannot see it hurting until next oil change due.

lynall said:

20/50 is really for tired old lumps, though I cannot see it hurting until next oil change due.

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Fairly sure the 1600 in the mga takes 20/50 as well.

Interestingly the tractor which should fit that description is straight 30wt.

dag019 said:

Fairly sure the 1600 in the mga takes 20/50 as well.

Interestingly the tractor which should fit that description is straight 30wt.

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Two old tractors I have just serviced took 15/30, I said are you sure? seems awfully thin for an old clunker, from what I could gather same oil was in engine and rear end and hydraulics.

lynall said:

Two old tractors I have just serviced took 15/30, I said are you sure? seems awfully thin for an old clunker, from what I could gather same oil was in engine and rear end and hydraulics.

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yep, that is the same with the major, original book spec is S.A.E. 30 H.D in engine, gearbox, and rear end (also the hydraulics on a major). Although there is a school of thought to use modern multi grade oils as you can still get HD30 I run that.