I always used castrol 10w30 and OEM filters on my SWB. Perhaps that's why I never got a tick. (motor was clean as whisle inside besides the part where I blew a head gasket) <img src="/forums/images/graemlins/kewl.gif" alt="" />

On my V6, I run Mobile 1 5w30 and Mobile filters; Ticks like a bastard. <img src="/forums/images/graemlins/frown.gif" alt="" />

So why do you guys run 20w50 on those engines anyway? Isn't it good to stick to factory recommendations? I always thought the thicker oils would make the engine do more work and get less power+fuel economy. <img src="/forums/images/graemlins/confused.gif" alt="" />