Have Castrol changed the formulation for this oil recently? Everywhere I have tried so far seems to sell RS 0W40, not the 10W60 stuff recommended on Scoobynet. Are there two different grades, or has the 10W60 been discontinued?

 

Have you tried Demon Tweeks...?

 

I brought some from Castrol Classics (01954) 231668 just last weekend. 5 litres of 10/60 for £36 delivered.

 

Blimey, that's reasonable!

 

i remember reading in some evo forum that the new rs 10w-60 is not as good as the old stuff (something about film strength or something). the ones to go for are the castrol tws 10w-60 which is the same as the old rs 10w-60, just a diff name. this tws 10w-60 is available from all bmw dealers (if you can't find it else where)as it is used in all M3/5/Z8 engines to solve the numerous blown engine problem.