Bought a 84 TT600L it's got a dry sump the manual says it takes 2.4l of oil but when i drained the oil there was almost 3l of oil in it but the oil doesn't show on the dipstick even after the motor ran for a while and if i open the bleed screw on top of the oil filter while the engine is running there is no oil coming out fitted new oil pump but still no oil help please