Hi I serviced my car about 3 weeks ago and after I finished and started it back up it made a crunching noise 4 a few seconds, and now I'm hearing a knocking tapping noise when I'm pulling away in low revs or if I'm reving the car high, iv also gone thought a bottel of oil in 3 weeks what is going on lol but others than that the car is at full power, does hold back in second gear 4 a second or 2 then shots off