may i ask Nick , why you do not speak of 10W60 ?
we use that in all our BMW engines....
i can imagine we have more profit of high temp protection instead of by - 30 °C ?
Hi Barry,
The reason why I didn't mention a 10w60 oil was based on Tim's advice below:
In many circles it is seen as a superior viscosity but as it is so thick, it reduces oil flow, puts more strain on components (especially the oil pump), slows the oil flow (so less hydrodynamic protection) and reduces power and efficiency.
It is the above reasons why BMW do not list it as a recommended viscosity for these engines.
A good quality Ester-Synthetic of viscosity 0w40/5w40 will provide all the protection our engines would need even under hard track use.
That does not mean that all engines shouldn't use 10w60 however, but its use should be limited to those which specifically ask for it. There is more detailed information
here for those interested.
Regards,
Nick
