[BikeGuy63]

Ive been a BMW guy for 25 years. Owned multiple 3,5 and 7 series. In 2017 I purchased new a 540i G30. About 4 months ago the AC stops blowing cold air. Needs a recharge. Dealership puts die in the system and recharges it and send me on my way. Couple of weeks later I am back because the AC isn't working again. The only die they find is coming from the low pressure valve. So, they replace both. At the same time, I have the oil changed, the AC system pressure tested and the flex disc replaced. Tech is test driving the car and starts making noises and blowing smoke. At the same time they also find a coolant expansion leak. The engine noise and smoke is supposedly due to an impending PCV valve failure. They are claiming that they need to replace the valve cover (PCV is part of it?) for $3500. This leads me to the following questions.
1. Is iit just dumb luck that the PCV and expansion tank leaks fail after they do the above service items or is there anyway their could be a cause and effect.
2. Do you really need to replace the valve cover to replace the PCV valve?
3. Do I have any recourse with BMW? The car has timed out the warranty but not mileage.

Thanks everyone for helping me out

[srybicki]

Get a local euro shop to put a new valve cover on it does have the pcv filter

[Igor_M5]

Leaky expansion tank, inevitable. Replace it with a URO brand tank to avoid another cracked one at 20-30k miles. Get the return line as well.

Failed PCV, inevitable. Order a new diaphragm, swap it yourself. https://www.ebay.com/itm/314368493183?

To get yourself one foot ahead, order and replace the Fuel Tank Breather Valve (URO brand as well).

Your next coolant leak will be hard to find, but it’ll be right from underneathe your manifold, a plastic fitting that connects the cylinder head and the upper radiator hose.

You welcome

Ps, I can assure you the front tension strut control arms need replacing too.

/fellow 2017 540i owner

[BikeGuy63]

Thanks

[BikeGuy63]

Originally Posted by Igor_M5

Leaky expansion tank, inevitable. Replace it with a URO brand tank to avoid another cracked one at 20-30k miles. Get the return line as well.

Failed PCV, inevitable. Order a new diaphragm, swap it yourself. https://www.ebay.com/itm/314368493183?

To get yourself one foot ahead, order and replace the Fuel Tank Breather Valve (URO brand as well).

Your next coolant leak will be hard to find, but it’ll be right from underneathe your manifold, a plastic fitting that connects the cylinder head and the upper radiator hose.

You welcome

Ps, I can assure you the front tension strut control arms need replacing too.

/fellow 2017 540i owner

Thanks for your insights. I very much appreciate it.

[m3rxn]

Just out of curiosity, how may miles on your 17 540i?

[Doctor X]

Originally Posted by Igor_M5

Leaky expansion tank, inevitable. Replace it with a URO brand tank to avoid another cracked one at 20-30k miles. Get the return line as well.

Failed PCV, inevitable. Order a new diaphragm, swap it yourself. https://www.ebay.com/itm/314368493183?

To get yourself one foot ahead, order and replace the Fuel Tank Breather Valve (URO brand as well).

Your next coolant leak will be hard to find, but it’ll be right from underneathe your manifold, a plastic fitting that connects the cylinder head and the upper radiator hose.

You welcome

Ps, I can assure you the front tension strut control arms need replacing too.

/fellow 2017 540i owner

My car shakes at higher speed when I'm applying the brakes. I think it has something to do with the the front tension control arms/bushings.

What are some signs/symptoms of this failing?

Do you know the part number for the bushings/control arms.

Not sure how expensive this will be.

[USNA97SWO]

Hey, my first BMW was an '89 325is.

I am having the SAME exact issues with my current '17 540i. Dealer is asking for $4k to replace the valve cover assembly.

What did you end up doing and did it work?

Thanks in advance!

[RonronEG]

Originally Posted by Igor_M5

Leaky expansion tank, inevitable. Replace it with a URO brand tank to avoid another cracked one at 20-30k miles. Get the return line as well.

Failed PCV, inevitable. Order a new diaphragm, swap it yourself. https://www.ebay.com/itm/314368493183?

To get yourself one foot ahead, order and replace the Fuel Tank Breather Valve (URO brand as well).

Your next coolant leak will be hard to find, but it’ll be right from underneathe your manifold, a plastic fitting that connects the cylinder head and the upper radiator hose.

You welcome

Ps, I can assure you the front tension strut control arms need replacing too.

/fellow 2017 540i owner

This is so dead on it should be stickied. Had each and every one of these failures on my 2017 540i LOL.

[eric_gm]

Originally Posted by Igor_M5

Leaky expansion tank, inevitable. Replace it with a URO brand tank to avoid another cracked one at 20-30k miles. Get the return line as well.

Failed PCV, inevitable. Order a new diaphragm, swap it yourself. https://www.ebay.com/itm/314368493183?

To get yourself one foot ahead, order and replace the Fuel Tank Breather Valve (URO brand as well).

Your next coolant leak will be hard to find, but it’ll be right from underneathe your manifold, a plastic fitting that connects the cylinder head and the upper radiator hose.

You welcome

Ps, I can assure you the front tension strut control arms need replacing too.

/fellow 2017 540i owner

Invaluable info, pal. Thanks. BTW, that eBay link is not working. What should we be searching for? Keywords?

[JSKS76]

Does the pcv diaphragm also work for 2020+? I noticed the sellers listing it as upto 2019 for G30.

[RonronEG]

Originally Posted by JSKS76

Does the pcv diaphragm also work for 2020+? I noticed the sellers listing it as upto 2019 for G30.

I believe after 2019 it was no longer serviceable independently. The entire valve cover has to be swapped out.