Got my 4.4 in today getting the alternator oil leak done along with a trans refresh (solenoids/seals etc). Hope to be rid of some EPIC trans slam...

I've also just noted a coolant leak in both cars. The 4.8 appears to have it at the bottom of the radiator, and the 4.4 we are trying to find (had low coolant but a pressure test hasn't revealed any leaks yet)..

The 4.8 is off the road while I fix the air suspension so the leak will get attended to at the same time.

So.. I was on a FB page where a guy was opining about only using the BLUE coolant, and I have GREEN coolant in both cars... did a search on the forum here and some old posts say it makes no difference, others say only BLUE....

Leaks in both cars mean either it does make a difference or they are both going out in sympathy with each other....

Any thoughts anyone?

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2006 E53 X5 3.0D
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2007 E60 540 M Sport LCI (All time favourite car)
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