|
According newtis.info coolant should be changed every 4 years for non M cars, and every 3 years for M cars.
I'm thinking about changing it myself too because I have free time nowadays, and I have the Coolant Refill Air Purge tools to refill without introducing air to the coolant system. However, I'm unsure why there's a need to bleed the coolant system afterwards but it's in the instruction.
I have changed coolant using the Coolant Refill Air Purge for many Japanese cars and I didn't need to bleed the coolant system afterwards at all. The tech manual for all those cars called to bleed the coolant system afterwards, but I never had to because the tool prevented air entering the coolant system. I think BMW just being extra careful. This is just my opinion
Another part I'm a bit unsure is the secondary coolant system. It has instructions how to remove it but the manual doesn't call to replace it as a maintenance item.
I also wondering did you get it done or have the dealer done it?
|