my vr6 has a slight oil leak from the front of the engine, only leaks when its on my drive which is a slight hill, any flat surface and it wont leak! think its coming from the oil filter housing, the screw cap where you have the big plastic cap and 32mm nut on it to get the oil filter out or the 2x sensors on the oil cooler whatever they are for? it has been serviced recently. the screw cap with the 32mm nut has oil running down it i noticed! not a lot though!