Best oil for 320i?

[mrcool]

I am servicing my 320i and wondering which oil is best suited. I checked an application guide and looked and found different opinions.

Commas' guide says semi-sythetic 15W-40. I would have thought 10w-40 for scotlands colder climate tho?

[mrcool]

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[hazd31]

i have always used 10w-40
tbh it doesent relly matter what you run, just keep it fresh and it will go forever
would be good to know as im going to buy a 25l drum of the stuff!
as i do a ot of miles and shound be servicing it every 5000ish
oil doesent go off does it?

[e30ron]

i used 10w- 20 fully synthetic in mine mate it seems ok but the tappets are a little tappy might try something a bit thicker next time.

[stonesie]

I always use Vauxhall branded (shell) 10/40 semi synthetic and have never had a problem with it, it's not expensive either.

[grantfk10]

I would have thought 10w-40 for scotlands colder climate tho?

Depends how far north you are, lol!

[hazd31]

just brought a 25l drum of 15w40
£54 and will last me a couple years so well chuffed

[e301988325i]

I use 5w(winter)-40 and get good oil pressure.

[asmith88]

i dont think you can really go wrong with a nice 10w/40 semi synthetic all year round.

[Morat]

10/40 semi as approved by His Moooreship.
I can't see anything wrong with going to a 5/40 if you want to go fully synth but there's not really any point. You'll just burn more oil on startup.

The key is the 40 in the second number - that is the correct viscosity for the engine at operating temp. 0/5/10/15 is the viscosity when cold (ie startup). The lower numbers give more protection for the first few minutes but 10/40 semi is better than the stuff these engines were designed for, and can run 300k on (with regular changes).