@
symze01 thanks for the prompt response. I absolutely agree with your point on the group complaint. I had a mechanic look at changing the ATF but he suggested that I would most likely be a temporary fix. There is a slim chance that getting the ATF flushed would resolve the problem but that probability is around 10-20%. Although the cost for flushing the ATF is significantly less than getting a new gearbox, I've already invested a lot into maintenance for this car and being a BMW owner for over 21 years, I'm just fed up with the constantly decreasing quality that these cars are getting. In hindsight, I probably shouldn't have bought this Gran Tourer when it first came out as it was a completely new platform and it was bound to have problems down the road. But hey, it is what it is and right now there's nothing I can do other than going forward with the group complaint.
I'm interested in your group complaint idea, if in the UK. I have a 2008 X1 xdrive that had gearbox problems diagnosed after only 11k miles (18k km). It was the usual rough gear changes, valve leaking issues that produced no surface level error codes but, when thorougly investigated by BMW, found errors on the gearbox.
I bought the car second hand from Arnold Clark and reported the issue less than 6 months after purchase. This places it inside the timescale for the Consumer Rights Act 2015 whereby the law assumes the fault was pre-existing and the retailer has the onus to prove it wasn't (impossible?). Arnold Clark requested an inspection at a BMW agent. I took it to a non-Arnold Clark BMW agent for inspection due to a lack of trust. This proved useful as Arnold Clark would put nothing in writing; as I had paid for the inspection, I have the report stating the gearbox is defective and recommending replacement. Left to Arnold Clark, I would have no evidence.
Arnold Clark refused to repair, replace or refund - this was the first time they had written anything down.
I took this case to the Scottish Motor Trade Association (SMTA) and forwarded all communications (summaries of phonecalls, copies of all emails etc). Arnold Clark ignored two letters from the SMTA over some weeks. I escalated again and today got a result. Arnold Clark have now voluteered to replace the gearbox at no expense to me. I will hold my breath until it happens and check rigorously that it had been done, and done properly.
I have written this in case anyone else finds it useful. The contents of the Consumer Rights Act 2015 should be essential reading for anyone buying a car - it does provise some useful protection.
I have also written this to add to the catalogue of 2018 X1s with defective gearboxes and would be happy to help if a group complaint goes in to BMW.