11-23-2019, 11:49 AM | #1 |
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2017 340i weird coolant color in secondary
I was looking at a friend's 2017 340i with about 20000 miles on it and popped the coolant lids to check (as the B58 seems to be prone to lose coolant). Anyways both were just slightly low around the min mark but I noticed the smaller tank's coolant color was a bit off. The larger main tank was blue/green color while the secondary looked like pic below. Should he be worried?
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11-26-2019, 07:31 PM | #5 |
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cant believe how many b58s are prone to these coolant and oil loss issues. For the record, there is no way this is normal. Oil and coolant are clearly mixing which will almost surely lead to a grenaded engine in time.
My n55 for comparison had 45k and was 4 years old when I sold it. Coolant tank was light blue in color since day 1. |
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12-06-2019, 07:34 PM | #6 |
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He should be worried if the car is out of warranty. But if it's in warranty... he should still be worried. If there's oil mixing with the coolant, you want it fixed properly, not just some band-aid. At an absolute minimum, I'd want both the engine and coolant systems thoroughly flushed and I'd expect them to put some extra warranty on the engine. And also do a compression test.
Either way... oil in the cooling system or coolant in the engine... it's very harmful. Odds are, no harm done, but these cars are too expensive to just put a band aid on until it's out of warranty |
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12-11-2019, 09:12 AM | #8 |
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Is your friend's car still under warranty? If yes - please ask him to visit the dealer as soon as possible. This is definitely not normal.
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12-11-2019, 10:13 AM | #9 |
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He came back and said that coolant change in the secondary circuit is normal. Claims there was no oil in the coolant as oil would make it turn "milky"
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12-12-2019, 08:20 AM | #10 |
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If it's normal to turn that color, then how come mine is as clear and the same color as the engine coolant? I'd send a sample to an independent lab for checking and stuff the results in the dealer's nose. Buy a bunch of antifreeze test sticks and check it.
That second circuit only cools the air/water cooler, no reason for it to have been overheated and scorched. From my experience specifying steam heated glycol heat exchangers, the film temperature has to be kept below 345F or glycol deteriorates. |
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