my 09 miniS just reached 100K. on routine service, dealer just did oil change. when i asked them after waterpump and turbo, they just said don't do anything until they break. On other cars i have, they ususally change waterpump and do timing belt around 100K. i know there is timing chain in our engine, so no change there, but should i change waterpump now? and what about the drive belt. Anohter mechanic told me the belt looks crack, and i should replace it. And he also recommended "tension adjustment". I have no idea what it is. Should I do it? I havent done it yet. Any recommendation that i should do at 100k mile? thanks
Welcome. So, this can be a pretty loaded question on what to do for a service interval or preemptive strike. Turbos are expensive and labor is as well. If you go with aftermarket you can save some money, but labor is labor. So on some things waiting is the right thing. The motor you have is named a N14. It has a well known issue involving the timing chain and the chain tensioner. The tensioner can fail and that can cause the chain to stretch over time which is bad or even jump a tooth on the sprocket and that could be a very costly repair. Now that I have properly scared you, lets take a moment to level set. Not all the N14 motors have had this failure, but the internet is full of these stories. Here is what you can do. If a MINI dealer does your service, they have a tool that they can insert in place of the tensioner and it measures the slack on the chain.That tells them if you need a tensioner, a chain, or both. The tensioner is like maybe a $40 part + labor so that isn't so bad. The chain and guide rails have more labor involved and that will cost you more. However all of this is DIY with the right tools. A good independent MINI tech can do the same. One of the best things you can do for your car is to check your oil level often. Like every tank of gas. Keeping the oil topped off between changes, helps to keep the tensioner and chain damage in control. Also, change the oil like every 5,000 miles. Its a cheap item overall. I have attached a maintenance schedule document that covers some of items that should be handled routinely. Best of luck.
On the water pump and turbo, I agree with your mechanic - wait until a failure occurs. On the serpentine belt, if visual inspection shows cracks, then that should be replaced.