Hi,

I have got a '90 745, and there is some CSF brand radiator of unknown age.
What I have noticed is that there is some amount of white-blue deposits at the facets at the upper right corner. Does it mean that the radiator has corroded, leaking, and should be changed? There is not much of the coolant loss if any.
One summer day when I did a lot of very slow driving here in South CA the coolant was probably boiling, so that there was a trace of leak at the side of the coolant expansion tank, through the cap seal.

Any suggestions on what type of radiators are good for turbos are very welcome.
I know there are 3 and 2 row types. Do not know what type my CSF is. Surprisingly IPD sells a '3 row heavy duty' less expensive than the standard type.

Thanks in advance,
Wolandir