265 High oil consumption on one cylinder - mk3 265

Discussion in 'Mechanical - Engine, Gearbox, Exhaust etc' started by Bezi, Dec 19, 2025 at 8:56 AM.

  1. So a few months ago my timing belt snapped. I had the engine fixed. We put in new valves, valve stem seals, camshaft oil seals, camshaft pulleys, new belt kit and sealed the engine head. We also fitted new spark plugs and injectors.

    I had the car back for a few days, did about 300km and noticed that my engine drinks a lot of oil. I had to top it up twice, with a total of 1.5L, which is about half a liter per 100km.

    We took out the spark plugs and noticed that the spark plug on cylinder 4 was running hot, it was somwhat burned. The spark plugs were also new. When i took a look inside the cylinder, i noticed that cylinder 4 was very wet with oil.

    Of course my first concern was that its the pistong rings, but the compression test was fine. I had 8.5-9bar of compression on all cylinders. Car was luke warm (not cold, not fully warmed up).

    When i had my engine apart we inspected the pistons and none of them had any visible damage and scorching on the walls was also good.

    I already tried replacing one of the PCVs but it didnt help - I also think that it can't be the PCV because i have oil in only one cylinder.

    What could be the issue here?

    *Im attaching pictures of the pistions (when we were fixing the snapped timing belt), the spark plugs (cylinder 1 on far left, cylinder 4 on far right) and the compression test (bottom 4 readings).
     

    Attached Files:

  2. Hi! Milleage/kms of engine? That cylinder nÂș 4 seems like has burn some oil before the repair. We have the firing ring (to keep the compression and absorb the heat of explosion), scratching ring (to clean the cylinder and avoid the oil go up to the valves), and lubing ring (to distribute the oil for the cylinder wall). I think the scratching ring don't work well. Or some of the valve seals in that cylinder not fixing well. But watching the pics, there is burned oil in the top of the piston.
    Is my honest opinion, maybe I'm wrong!:sweatsmile:
     

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