M mastic Joined Feb 28, 2009 Messages 2 Location WV Feb 28, 2009 #1 Anyone know who manufactures the oil sold in GM dealerships sold under the Goodwrench brand name.
daves87rs Joined Feb 23, 2009 Messages 20,738 Location Michigan Feb 28, 2009 #3 anybody know if it was Valvoline at one time?
J Jim 5 Joined May 25, 2005 Messages 4,009 Location Calgary Canada Feb 28, 2009 #4 In Canada it's Petro Canada. I had a really good UOA on the GM dealership fill.
