I have a MY2012 Citroen DS3 Racing which has done 50k km. or about 30k miles. For years I have been living in fear of the inevitable THP engine "blow-up" and it now seems like the time has finally come


Lately I've been experiencing rough idle and occasional blue smoke from the tailpipe during hard acceleration. The oil comsumption has also suddenly increased by quite a bit. Yesterday I was doing an oil change when I immediately noticed a strong smell of petrol as I was draining the oil. The viscosity of the oil also seemed lower than usual. After a search on Google on how petrol could possibly have gotten into the oil I quickly realised it could be a sign of a very serious problem with the engine. My initial thoughs are worn piston rings, cracked ring lands or broken pistons. However the car runs fine except for rough idle and maybe a little down on power. The EML is not lit and have never been. Also there are no faults stored in the ECU (checked with DiagBox). So.. what should I do next to diagnose this further? Could it be something less serious or am I possibly looking at a full engine rebuild?
The symptoms I've noticed are;
- Occasional blue smoke from the exhaust while accelerating.
- Rough idle - "popping sound" from the exhaust like a misfire.
- Petrol smell from the oil and dipstick.
- Unusally high oil comsumption.
What I've checked so far;
- ECU faults - none detected.
- Twisting off the oil filler cap checking for vacuum - vacuum seems fine sucking the filler cap against the rocker cover.
Appreciate any tips or hints on what to do next.. cheers guys
