Quote:
Originally Posted by Landiah
I imagine it’s a similar thing here. Tech said it was cosmolene.
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I'm reluctant to disagree with a tech's diagnosis/opinion.
But I have to question blaming that stain on cosmoline. Now my Cayman S had plenty of cosmoline sprayed on the engine, drive train, some suspension hardware and probably on the exhaust.
I just recalled I took some pics of my M2 on the lift during its first service.
Won't take the time to transfer the pics from my phone to my MacBook Pro and post the pics, but I reviewed each one and I see no real sign of cosmoline -- at least as it appeared on my Cayman S -- in the pics.
Could be BMW uses a lighter treatment? I can't say. I'd have to be under the car with this in mind and look more closely for a more translucent rust preventative.
I will refer back to my first post and restate I believe the stains are coolant. It is quite normal for coolant to after hitting a hot exhaust for the water to evaporate (to state the obvious) and (maybe less obvious) leaving behind white stain. It is the antifreeze residue. White? Yes, in small amounts and dry the color will be white. Only when the coolant leak is wet (as I have observed several times over the years from water pump seals and radiators) there will be antifreeze color (green-ish or red-ish) to what one sees.
See attached pic of my Turbo's leaking water pump.
And I've attached a pic of my Boxster's leaking water pump and you can make out the light/white stain on the housing under/below the pulley.
But even if I'm right this does not necessarily mean there is a leak. It could be that in filling the engine with coolant or perhaps topping it up during its PDI some coolant was spilled.
An active coolant leak and especially one that is suspected of dripping coolant on a hot exhaust would have the car stinking of antifreeze.
Absent the odor of antifreeze from the hot vehicle and after it has sat a bit, absent any signs of coolant under the car, or the stains changing, and with careful monitoring of the coolant level and no change in the level then I would offer there is no active leak.