depends what protection you want the ow/40 will be a better protection oil than the 5w/30 as it is a better quality normally the ow/30 castrol edge is a very good oil which i sell in my shop depending on what protection you want as the 5w/30 would just be standard which castrol also do called castrol magnatec.

 

5w/40 Castrol EDGE :thumbsup

http://www.castrol.com/castrol/castrolhomepage.do?categoryId=3205

Its also recommended by BMW.

 

As long as you book online you can get an oil & filter change using Castrol Edge 5/30 at National Tyres for £31 which is a very good price

 

thats not bad but they might say they putting that in and they use cheaper oils like most garages do

 

Do the oil change yourself, genuine BMW filter and Castrol Edge 0-40w... you are in control of what goes in

 

Hi all, thanks for brilliant replys. Did think about the national filter and oil offer, but heard such bad things about our local one, will be doing myself

 

Btw I meant 5w/30 not 5w/40 :hihi

I think 0/40 is a tad thin tbh, 5w will still be fluid to like -60 C with EDGE, so unless you're planning on driving over Everest, I would still prefer 5w personally, but its up to you, either is a good for your engine.