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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > BMS catch contents
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      11-18-2020, 05:22 PM   #1
ChanceG8X
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BMS catch contents

Anyone think this is a problem at all never had any coolant problems or anything but better safe then sorry. Opened it up today to find that it was like water not oily like.
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      11-18-2020, 05:46 PM   #2
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Has it been cold, like freezing recently? With a remote catch can, it’s possible for moisture collection (along with any other condensable engine vapor), and obviously worse if the lines freeze closed, if it’s that humid/dense for long.
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      11-18-2020, 06:06 PM   #3
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Yea just put it in a month ago and its been about 37F out hasn't been warm at all.
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      11-18-2020, 06:14 PM   #4
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I've heard this is common in near/below freezing temps as visionaut alluded to.
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      11-18-2020, 09:09 PM   #5
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Sounds good to me dont want to pull the head off any time soon
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      11-18-2020, 09:33 PM   #6
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How long is your daily commute? Does the car have a chance to warm up to operating temps? My brother use to dump a catch can full of water atleast once a month during the colder months on his turbo IS300. His commute is under 10 minutes ,so his car never reached operating temps.
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      11-19-2020, 10:39 AM   #7
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Those things are pretty much a waste of time on N55s. You're collecting condensation in a metal can that freezes in winter. On a normal 15 minute drive your car would burn off that water and send it out the exhaust, now you have to manage the liquid level in a canister that has marginal value. These cars have very little blow by into the intake system, at 60k mine had a minor film but no accumulation.
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      11-20-2020, 05:41 PM   #8
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It's normal to get a mix of oil, water, and gas captured in the can. Especially during colder weather you'll get more water in there.
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      11-22-2020, 11:49 AM   #9
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As of right now I have 52k miles just got it as an extra little supporting thing. But ya my normal commute is about 15 minutes normally let the car idle for 3-5 mins before I drive it so the oil can warm up a little.
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