S63TU injector replacement

[SoupAnxiety]

Hi,

I have an early (2011) F10 M5, with the S63TU. There seems to be two broad camps on how to approach the injectors -

1. The injectors are made of chocolate and cause engine failure without warning. Replace all immediately after purchase, regardless of if the car has any signs of leaking injectors.
2. The injectors may or may not fail, pray to the injector Gods. Wait for signs of leaking injector(s) to develop, then replace all if they do.

I'm not shy about preventive maintenance - I've had the M5 rod bearings changed and gearbox serviced, my car is a keeper and I will continue to put money into it. From my arduous time with an N53 engine, my opinion is replace all injectors when signs develop, and don't try to clean, recondition or chase individual injector faults.

My N53 injector saga boiled over with a stuck open injector coming back from Wakefield, it was bad but the car was and continues to be fine after I bought a new set of latest index injectors. The M5 has been my daily car since last February, used all year round and (injector God sacrifice at the ready) my injectors are fine, and don't have the N53 symptoms.

My ask is if I'm looking at N53 scenario of obvious signs of failure before things go south? My N53 had the rough idle from cold start for a long time, I spent too much time messing around with injectors and dubious used examples before the Wakefield drama. Injector cleaner made no difference, either as a routine or reactive item. Knowing what I know now, I should have bought a full set of injectors earlier and saved myself the headache.

Does this track for the M5 and the S63TU?

Thanks.

[A44RON]

2015 M6 owner here with the same engine and yep that pretty much sums it up.

When I first took delivery of mine over a year ago it had c40,000 miles on it, and the first thing I did was immediately buy 8x new EU5 Fuel Injectors, 8x new spark plugs and 8x new coil packs and got it serviced by my local BMW ///M car specialist with fresh Liqui Moly Leichtlauf 5W-40 oil and got them to fit all the new parts - you just don't know how it's been treated previously to your ownership and what garbage fuel they could've been using.

Given yours is a very early car and those original injectors are now approaching 15 years old, I'd consider just getting 8x new fuel injectors. That way you've got peace-of-mind and just give it minimum 98 RON octane fuel with a high quality PEA-based fuel injector cleaner every 5,000 miles to keep the carbon deposits at bay and help prevent an LSPI super-knock event

hope this helps