oil in range extender (Rex) coolant expansion tank

BMW i3 Forum

Help Support BMW i3 Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

max4444444

New member
Joined
Nov 11, 2021
Messages
2
During monthly REx (range extender) run white smoke and oil smelling exhaust came out. Oil was mixed in the coolant and it looks like the expansion tank overflowed. Oil is low on dipstick now.
Could this only be a head gasket failure or are there other (less expensive) causes?
There is something called an oil to coolant heat exchanger attached to the block, could this or another place where oil and coolant could mix be the problem?
Haven't seen any other posts about this.
Thanks,
Max

I posted this message in another area. Hope it is OK if I also post it here. This looks like a better area for this topic.
 
Back
Top