Quote:
Originally Posted by upshift
I don't think using 5w40 would cause it to explode immediately, but Ford designed the motor for 5w20 and that's what I always used- even on ex police vehicles with over 225,000 miles, the Motorcraft 5w20 worked great. I can't remember who makes the oil, perhaps Kendall?
Crownvic.net is a weird place.
|
Theres some controversy around that theory. 5w20 oil is popular with a lot of car manufacturers for vehicles sold in the US. Outside of this market they specify higher viscosity oils for the exact same engines in the same cars. They specify 5w20 here because the EPA is pushing them to improve fuel economy via the lubrication system. They're trading off long term wear for a minuscule bump in fuel economy. In a climate like Atlanta, theres no reason why 5w40 would hurt this engine.