Hi all did an oil change on the weekend (used 15/50 mobil 1 fully sythetic) and every time i start my s2 from cold i get white/grey smoke. when the car is warm deres no smoke on idle, im pretty sure im gettin puffs of smoke on overrun so im guessin the oil seals in the turbo hav gone? can i put a thicker oil in to stop it seepin past the seals in the turbo?