Quote:
Originally Posted by zzmac
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?  |
I run 10W-40, which would be in between. Also, it is what my engine builder recommended. 20W-50 will take longer to get to operating temperature. Other factors are where you live (cold vs warm climiates) and your driving habits (low RPM vs high rpm), how often you drive your car, how long are your drives, where you drive your car (track?), etc.