Injectors? Or Gearbox Service due / Low oil

[X6M50d2025]

Hi All

I'm wondering if anyone has experienced this issue and any ideas...

E71 2014 63reg X6 M50d, now on 110k 1 prior owner, FBMWSH upto date.

So.... in January I experienced a noise under accelerating only which sounded a bit like an injector knock or due a service.

Oil level good, never let me down in 10k, no smoke, average 29.5mpg, no power loss, no rough idle, no issues at all runs like new.

So I had a full Service with best recommended oil including all filters and fuel filter. It didn't solve the issue.

What I have now found is when driving under acceleration you get the noise but not if coast / slowing down. Its subtle and misses doesn't notice it, can't hear externally or if drive in a multistory etc just in cabin. 

Today I've found if parked in D on tick over I hear it how ever if in N I don't and not even when rev...

Is it just a high miler issue / injectors tired but OK or something else like low Gearbox oil?

Google states noises under load in Drive and not Neutral can be transmission or Injector so thought I'd ask people with a clue not google. Worst case I'll have Gearbox ZF Service done and injector test on all banks.

Thanks in Advance.

[Greydog]

Morning Darren

Welcome to the Forum

Great motor 

First 110k is not high miles for one of these engines if it is well maintained my brother inlaws 540d xDrive Touring has been ECU tuned since new and produces 400+ hp is currently North of 200k and going strong

A full Diagnostic check would/should tell you more, a smooth running test on the injectors will show any that are out of step. If the transmission hasn't had a service it is due one at 110k, both Diffs (Note the Rear Diff has two chambers which hold different fluids) will need service as will the Transfer case and Gearbox if your having this done at a Dealer it will not be cheap around £900 to £1000. Check Tyres carefully they should be the same make Front and Rear and prefferably BMW approved and star rated.

Dave

 

[X6M50d2025]

Hi Dave

Thank you very much for the reply, that's really handy information. I aim to keep it for as many 100k's as I can just to see how far it will go as my commuter. I shall get it booked in for the above so really appreciate the details. 

Darren