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Extended Services/Tuning Boxes - Dude - {P}
Is there any wonder that buyers of ex fleet and many privately owned turbo diesels run into turbo and fuel pump problems at less than 50k miles on the used car market, and then get an adverse opinion of the vehicle as a result of abuse by the previous owner/driver.???

After visiting BMW forums for some years, it is now common practice for most turbo diesels to run 17k to 20k before oil changes, which (Like H.J.) I believe is far too long for the long term durability of the engine and its main components.

In addition, many are now fitted with tuning boxes and the extra performance used to the full, to add further stress on the engine/turbo. These units can then be removed without trace from an unsuspecting buyer on the used market.

Thankfully I was fortunate to buy my turbo diesel from new, but I would`nt touch one second hand without documentary evidence of oil changes at 8k max.!!!