I recently changed my oil from Luqui Moly 5W40 oil changed to Castrol Edge 5W30 in my E46 and I cannot believe there is such a dramatic difference.
The engine revs a lot easier. The best way is I can describe it - it's like the difference between running an engine with a fan clutch installed vs. removing the fan clutch on the same engine.
This winter I also had some long cranks in -20 Celsius weather. Previous winter I had no such problems with M1 0W40, cranks were very short and engine fired up right away.
I think Dr. Haas was onto something when running 0W20 in his Ferrari. My car certainly seems happier with 5W30.
The engine revs a lot easier. The best way is I can describe it - it's like the difference between running an engine with a fan clutch installed vs. removing the fan clutch on the same engine.
This winter I also had some long cranks in -20 Celsius weather. Previous winter I had no such problems with M1 0W40, cranks were very short and engine fired up right away.
I think Dr. Haas was onto something when running 0W20 in his Ferrari. My car certainly seems happier with 5W30.