I actually have a small leak at the firewall end of
both valve covers (that's where the dye shows up) which was going to be my next project after the
oil change. I don't know the viscosity of what's in there now but maybe the 20/50 will save me some work.
The guy I spoke to at Roush said a 10W30 is fine if I don't drive the car hard. Would there be any negatives if I used the 20/50 if I don't drive the car hard or should I switch to the 20/50 and just start driving the car harder?
