Hello! I am the owner of a Volvo V50 2.0d built in 2006. For a short time I find that when accelerating in the 4th, 5th and 6th gears the revometers at about 1800 revolutions jumps up to approx. 2200 revolutions and then immediately falls back to the starting value. From the engine a latent throbbing is audible. It (engine) sounds as if the tires were spinning. However, I can safely rule out that the tires are spinning. The problem occurs permanently. In the 1st, 2nd and 3rd gears this problem does not exist. I tested the clutch insofar as I wanted to drive on the handbrake and inset gear. In doing so, the clutch grips perfectly. Oil exit in the area of the engine could not be detected until today. Can anyone help me?? Thank you!