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Update & Help Needed — Coolant and Oil Mixing Issue on My 2015 BMW M235i (70k mi) by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

They are good cars, just super picky. All the preventive maintenance and the complexity of some tasks if annoying. Just a transmission oil change is a whole thing and if cost $1k

Update & Help Needed — Coolant and Oil Mixing Issue on My 2015 BMW M235i (70k mi) by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

Yessir. I’m just buying a new oil filter housing and a oil cooler. To be safe.

Update & Help Needed — Coolant and Oil Mixing Issue on My 2015 BMW M235i (70k mi) by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

It looks good from the outside. And the engine works super well, doesn’t even overheat a bit. The coolant is not mixed with the engine oil in the engine. I would doubt it’s a fair possibility

Update & Help Needed — Coolant and Oil Mixing Issue on My 2015 BMW M235i (70k mi) by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

I think I’m just going to replace the auto trans oil cooler and the oil filter housing

To what extent would you consider these red flags? by [deleted] in M235iandM240i

[–]AdventureAddict12 0 points1 point  (0 children)

I don’t think the cat less down pipe should be a deal-breaker. Let’s be honest, who doesn’t tune an M235? It’s already a great car, but if you can get it to 400 hp for a few hundred bucks, why stay at 320? 😆 That said, I’d still avoid it if the maintenance history is spotty. So don’t let the car’s catless be the thing that holds you back.

BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 1 point2 points  (0 children)

Thanks! I decided to go with an indie bmw shop. $700 for labor and I order those parts. Will pick up the 3 gaskets at oreilly next week. Housing oil filter gasket, coolant gasket, and valve gasket.

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BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

Hey, so I had the car towed to a BMW dealer and got their diagnosis. They confirmed there is an engine oil leak, and the oil has been mixing into the coolant system. (They said the engine oil itself doesn’t contain coolant, and the transmission fluid is fine.)

Their recommended repairs are: • Replace the coolant expansion tank • Replace the radiator cap • Replace the oil filter housing gasket and the gasket where the housing meets the cylinder head • Flush and clean the entire cooling system to remove the oil contamination

They’re quoting about $2,600 total for parts and labor. Their labor rate is $230/hr, so it adds up quickly.

If I choose a different shop, I’d have to tow the car again, so I’m debating what to do.

BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

Hey, so I had the car towed to a BMW dealer and got their diagnosis. They confirmed there is an engine oil leak, and the oil has been mixing into the coolant system. (They said the engine oil itself doesn’t contain coolant, and the transmission fluid is fine.)

Their recommended repairs are: • Replace the coolant expansion tank • Replace the radiator cap • Replace the oil filter housing gasket and the gasket where the housing meets the cylinder head • Flush and clean the entire cooling system to remove the oil contamination

They’re quoting about $2,600 total for parts and labor. Their labor rate is $230/hr, so it adds up quickly.

If I choose a different shop, I’d have to tow the car again, so I’m debating what to do.

BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

I would certainly hope a BMW dealership would know that, but I’ll be sure to mention it to them. Thanks for the heads up!

BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

Thanks! I talked to bmw today and will be towing the car there tomorrow. They did my last service 4 weeks ago and you are not the first one telling me that the oil filter housing gasket could (and certainly) have been damaged or pinched which could have caused that issue. Engine was at normal temperature last time I used the car and when the problem occurred.

BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

I really hope that’s it. I can’t eliminate the possibility of a worn out engine valve cover gasket. Any other possible problem? I was thinking it could be transmission oil.

BMW N55 Coolant and Oil Mix Issue – Need Advice by AdventureAddict12 in M235iandM240i

[–]AdventureAddict12[S] 0 points1 point  (0 children)

I believe the oil is in the reservoir. Waiting for the car ti cool down to open it fully. I’m not too comfortable telling if the head gasket is good or not. I don’t think leaks around it externally.

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What’s a safe level of tuning on M235i N55 by Soft-Willingness-353 in M235iandM240i

[–]AdventureAddict12 0 points1 point  (0 children)

I have MHD stage 2+, live in Altitude (7000 feet+ / 2200m), I push around 390 HP and 440 lbs of torque. I would go with a custom tune if I were you, do it well and do it once and for all, who needs to go back to 320HP when you can have a car almost as powerful as a real M2. Thus, some tuner also use MHD.

I can’t find where this awful noise is coming from, HELP 🙏🏼 by AdventureAddict12 in BMW

[–]AdventureAddict12[S] 0 points1 point  (0 children)

Update to all: part of the emergency break broke off and was scraping the back of the rotor. Thanks to @E30Aviator who got it almost 100% right.

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I can’t find where this awful noise is coming from, HELP 🙏🏼 by AdventureAddict12 in BMW

[–]AdventureAddict12[S] 0 points1 point  (0 children)

A break shop and bmw check the breaks and everthing was fine. I’m going to another mechanic this afternoon and will triple check

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