Oil Service

[MRE21]

Anyone know what grade oil I should use for my 320/6?

Cheers

Ally

[cdavie2002]

15/40 mineral, iirc

[E21meister]

You can also use 10w/40 semi-synthetic (as I do on a B23 lump) depending on the age & mileage of the engine, this was Opie Oils advice to me. 5,000 miles on, it's proved a good decision. All a 'semi-synthetic' is, is a combination of as little as 5% (and no more than 30%) hydrocracked oil. However if your engine is high mileage and original, then a 15w or even 20w/40 will be a better better bet due to wear.

[petroscf]

Ok, can I also ask the same question for my engine?
179000 km, genuine inside except for the weber carb and handmade air filterbox (no air filter actually)
At about 100000 it started burning some oil, and I had a valves and springs replacement.
Otherwise it's totally factory, nothing else.
So what oil type should I use?

[E21meister]

However if your engine is high mileage and original, then a 15w or even 20w/40 will be a better better bet due to wear.

If your piston rings are original, I personally would go for a higher viscosity as above, as there is bound to be wear and therefore more chance of a thinner viscosity oil (like a 5w or 0w) pushing past the rings into the combustion chamber.
Of course, this is only my opinion and you should get the advice of someone more qualified, but going by all of the info I've had told to me over the years, that's what I'd do.

[MRE21]

Thanks guys I used 15w40 semi-synthetic as the mechanic told me that is what he used last time! Ally

[murran]

10w40 semi sythetic goes in mine. if theres no sign of it burning oil then id go with that. what went in these from new 20w50 mineral?

[E21meister]

10w40 semi sythetic goes in mine. if theres no sign of it burning oil then id go with that. what went in these from new 20w50 mineral?

That's what the Haynes manual says - 20w/50. I might ask the classic specialist at BMW Park Lane when I get the chance.