Join Date: Jul 2017
Location: Nobel Ontario Canada
Bullitt Year: 08
Bullitt Color: DHG
Bullitt Serialized Number: 4404
Engine oil is a big subject. Viscosity is the resistence to pouring. The ratings are based on water which has a viscosity of 1.00. Motor oil viscosity is typically measured at 100 C or 212 F. Most engines keep an oil temperature of around 220-230 F. At 250 F oil starts to breakdown and at 275 F you are in big trouble.
The second issue is, what's the outside temperature? At -40 F, 5W30 pours like Molasses, while 0W20 pours quite nicely and is ready to go to work. 5W20 is rated down to -35 F. The 20 number is harder to quantify. With modern engines, if your ambient temperature is up to ~100 F you should be OK. If you live in southern Arizona, then 5W30 would be a wise summer choice.
So, to summarize 0W20 if it gets really cold say -20 F regularly, 5W20 for all temperate climates and 5W30 for the hot spots. These ratings would refer to semi or full synthetic motor oils. For competition purposes the higher viscosity oil is appropriate.
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