1. use a good quality 10w40 mineral or semi-synthetic oil - I use/prefer Millers 10w40, but Triplex 10w40 from A-Z is good too https://www.eurocarparts.com/p/triple-qx-semi-syn-engine-oil-10w-40-5ltr-521776011
2. the 200tdi breather system is a poor design with no baffle in the rocker cover and the breather outlet easily pics up oil from the rockers, so the breather system is naturally oily.
3. remove and clean the breather system and replace air filter if old/clogged.
4. ignoring the dipstick level, drain the existing old oil including oil filter - fit new oil filter and measure in the new oil - once settled check against the dipstick, this will confirm if the right dipstick is fitted.
5. add diesel fuel leaner to the tank - this has probably not been done and will clean through the engine system.
6. now run and monitor the oil level over a 500-1000 mile test.

Colin Haig said:

My son's 200tdi is showing 140k . Has new turbo . Is consuming ( burning ) a lot of engine oil , a litre every 100 miles . No contaminate in the coolant . Before we rip it all apart anyone got any suggestions .Starts well , goes well . Seems to me its either burning the turbo's oil supply , there is blow back from worn bores , H/G is leaking or there is excessive crankcase oil pressure perhaps due to a breather problem . Am I missing anything ?

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