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Wondered about this as well, you hear about it often on E9x M3's/E6x M5/6's.
Glad they seem to be fairly reliable as I haven't found many threads on people having issues online. It's pretty scary as I noticed it's pretty expensive through FCP, but a little bit cheaper through Schmiedmann.
That's exactly how my system is operating, except I'm on 10W-60, thanks!
I haven’t noticed any loss in cooling after switching from CSF to new OE (street driving only). What was noticeable was the significant weight difference.
I recall on the old m3f that members essentially degraded their oil cooling effectiveness with a CSF oil cooler, and consensus was to keep OE or replace with new OE oil cooler.
My oil temps creep up similarly in those conditions, maybe 1-2 needle-widths past the midpoint. When I get moving it drops to 1-2 needle-widths below the middle. I run 0w-40 and noticed the oil temps fluctuate a bit more as compared to when I ran 10w-60.
That's exactly how my system is operating, except I'm on 10W-60, thanks!
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