Avoid at all cost especially if you need to claim

I purchased a 2012 Bmw 118d from car select oldbury in July 2015. On the test drive I noticed a rattle from the rear of the car i asked the salesman if he could have this looked into for me and he agreed to have their own on site workshop have it taken on a ramp to see what was causing the rattle. He said it was probably a loose heat shield and the 'lads' would put it right but needed to book the car in first. As I was happy with rest of the car I left a deposit and agreed on a collection date for the following weekend and was told the workshop would have fixed whatever was causing the rattle by then. I went to collect the car the following weekend as agreed and after signing all the relevant paperwork I was given the keys to my new car. And as soon as I drove it out of car select I heard the same rattle!! I phoned car select and they said bring it down and they'll have another look but it woudn't be until 2 weeks time! A few days later i found out car select had put in the wrong grade of oil for my car at the service they carried out on it prior to me buying it. So i booked it in at my local bmw dealer to have the correct grade oil and original filter replace the cheap parts car select had used and thought I'd get them to see what the cause of the rattle was. £50 later I was told it was a broken Flexi joint on the DPF and a whole new DPF would be needed at a cost of £1200 plus labour as the flex joint is not interchangeable on my cars DPF!! The warranty that was given to me with the car isn't worth the paper it's written on and they woudn't cover the failed part. So called car select explained to them it was the DPF flexi joint causing the rattle and would they replace it. They asked to see the car and said it was indeed the flexi joint on the DPF and they would have to replace it. The most shocking part to all of this came when I was told they would have to bring another bmw 118d from their Coventry site so they could swap my cars broken DPF with a used one from another car they had for sale!!!! I was lost for words when they told me this. I'm still waiting to hear back from blackhorse as their financed the car to see what option I have with regards to having a new part fitted rather than a old used one as I'm not having a used part from a donor car simply because I don't know how long that part would last. And when I asked what would happen to my old broken DPF the workshop said it'll be put on the other bmw 118d and the car would be sold at auction!!! So some poor sod will buy that car and be £1200 out of pocket because car select fitted a broken part onto it. I won't be buying any future cars from Lex Autolease Car select as the after sales customer service is a joke. Seriously read the other reviews about them as most are saying the same AVIOD!!