Have owned an Ambiente tdi for 6 years and 63k and had superb fuel economy. Last few months consumption has increased, local Skoda dealer diagnosed faulty coolant sensor and it was replaced. Fuel consumption still poor especially for first few miles on a cold engine 30mpg as opposed to 45 mpg when engine hot over same route and same driving style. However, last weekend when accelerating up to motorway cruising speed, I felt the car surging for a few seconds, speed was around 65mph and accelerating, then a mile or so later, accelerated from 70 up to around 80 to overtake traffic, looked in my mirror and all I could see was masses of white smoke. Eased off and smoke disappeared. I drove the car gently for 10 miles, back home. My Skoda dealer suggested the possibility of a blown turbocharger and it would be a costly repair, even using a Garret turbo. I took a day or so to reflect on what was best to do. Today I spent time reading through various posts on this excellent website and thought it would be a good idea to check my oil level. Horror. The oil level is a good 10cm ABOVE recommended mark on the dipstick. I phone my Skoda dealer and he says not to drive the car except for the 2 miles back into his garage next Monday and that it was diesel fuel mixed in with the oil. How can this happen? Anyone on this forum able to give an answer? Look forward to reading the replies.:eek:

Don't know much about diesels but if it's really diesel in the crankcase oil there must be some sort of leak from the injection system.

With a petrol, white smoke and rising "oil" level would be a blown head gasket allowing coolant into the engine. That could of course happen to a diesel as well but then the oil dipstick would smell of coolant.

I'm blowed if I can see how you could get what I reckon to be about 2 gallons of diesel into the engine sump! About the only possibility is one or 2 stuck wide open injectors, when I'd expect the white smoke to have shown up sooner.

Of course, burning excess lubricating oil in the engine can, in some cases, produce white smoke (hence the initial blown turbo diagnosis, which was my first thought too). It wouldn't be the first time someone using a power pump had over-filled an engine with oil though.

Could be that the oil cooler has failed, and its coolant thats increased the level.

If it is diesel, then it can only be a leaky injector.

I wouldn't be driving it AT ALL, you must get it towed if the level really is that high.

Agreed; regardless of what it is, if it's that high it must be up to the main journals, and I can see problems with engine internal pressurisation and oil aeriation.

diesel smoke is black so if it was over fueling it would be black.

if you gettin white smoke it could meen that the turbo is going and leakin oil into the air intake.

as for the over full oil...... you got me there unless someone over filled it by mistake.

personaly cant see how diesel would get in to the oil unless your pistons were leakin, but then you would feal a differance in performance.

I would go with the head gasket diagnosis....