I had this issue a while back, noticed it at my TB change around 70k and didnt think much of it; just thought it was a previous owner mix of green and pink.
Did a flush 2 months ago @ 100k cause the coolant turned brown again. Changed my oil cooler with this ECS one.
I have a slight leak from the rear coolant flange (I think thats what it is). When I did my clutch the tranny wasnt balanced too well and it popped up into the flange and some coolant shot out. I thought it was just because of the added pressure on the part from the tranny. Turns out the part is broken cause a few weeks later I get a low coolant light, and have been at a 2-3 week interval since.
Anywho.. topping the expansion tank this morning before work I noticed the coolant was Brown again .
Will a broken rear coolant flange cause oily coolant? I hope it will..
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