Deferred Maintenance 2015 M4

thedude123 · 04-15-2023, 09:06 AM

Hello all, I am purchasing a 2015 M4 coupe (manual 6 spd) this weekend. Car has 54xxx mi and is sold mechanically, though it does have some cosmetic flaws. Aside from oil changes, the owner has not done any real preventive maintenance. Thoughts on a list of things that I should look to have done in the near term? I fell like it's probably time for plugs. Brakes are original. I know there can be some issues with the diff seal as well as valve cover gaskets. Would it make sense to do any of these things, or anything else proactively? TIA!

Blocke · 04-15-2023, 09:10 AM

I would change all the fluids. As for vcg and diff seals, if they aren’t leaking I wouldn’t touch them yet. Just keep some money in the bank.

icebiker · 04-15-2023, 04:29 PM

If it’s manual you may find the brakes in surprisingly good shape even at that mileage. Depends of course on how he/she drove it but to be safe just check the onboard vehicle status and you’ll see if the brakes are due. I would however check the coolant expansion tank and top mount intercooler reservoir. The former has been known to seep (white residue along the seam) and the latter has been known to be low or empty due to leaks in the intercooler.

04-15-2023, 09:06 AM	#1
thedude123 Registered 0 Rep 1 Posts Drives: 2015 M4 Join Date: Apr 2023 Location: Florida iTrader: (0)	Deferred Maintenance 2015 M4 Hello all, I am purchasing a 2015 M4 coupe (manual 6 spd) this weekend. Car has 54xxx mi and is sold mechanically, though it does have some cosmetic flaws. Aside from oil changes, the owner has not done any real preventive maintenance. Thoughts on a list of things that I should look to have done in the near term? I fell like it's probably time for plugs. Brakes are original. I know there can be some issues with the diff seal as well as valve cover gaskets. Would it make sense to do any of these things, or anything else proactively? TIA!
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04-15-2023, 09:10 AM	#2
Blocke First Lieutenant 318 Rep 353 Posts Drives: 2015 AY M3 Join Date: Jan 2018 Location: Temecula, Ca iTrader: (0)	I would change all the fluids. As for vcg and diff seals, if they aren’t leaking I wouldn’t touch them yet. Just keep some money in the bank.
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04-15-2023, 04:29 PM	#3
icebiker Lieutenant 515 Rep 435 Posts Drives: 2016 F83 6MT Join Date: Feb 2019 Location: New Jersey iTrader: (0)	If it’s manual you may find the brakes in surprisingly good shape even at that mileage. Depends of course on how he/she drove it but to be safe just check the onboard vehicle status and you’ll see if the brakes are due. I would however check the coolant expansion tank and top mount intercooler reservoir. The former has been known to seep (white residue along the seam) and the latter has been known to be low or empty due to leaks in the intercooler.
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