What is high mileage for a BMW 3 Series?

Looking at possibly buying a 2014 BMW 320d with 136,000 for around £6k. Not sure if the mileage is too high?

Should I consider a high mileage used Toyota?

Is it a bad idea to consider purchasing a high mileage current version Toyota RAV4? My budget is around £16k and I really like the current-gen model (2019+), but the only vehicles that come into budget...

I want a Mercedes E-Class for high mileage - what diesel engine should I choose?

I'm after a high mileage E-Class Estate (2010-2016). Can you recommend a specific diesel engine that will do 200k as there are a lot to choose from? Also are the diesels chain driven?

Should I be concerned about a high mileage TSI engine?

Should I be concerned about a high mileage petrol EcoTSI engine? The car I'm looking at appears to be ex fleet, as it covered 90,000 miles in it's first three years, and then a further 20,000 in the next...