sae document j300 defines the highest single grade as 60. this is in reference to viscosity and not the quality of the oil
SAE 40 has a higher viscosity.
SAE 40 has a higher viscosity.
Type: SAE 10W-30, SAE 10W-40, SAE 20W-40 or SAE 20W-50 Recommended engine oil grade: API service SG type or higher, JASO standard MA Engine oil quantity: Periodic oil change: 1.00 L (1.06 US qt) (0.88 Imp.qt)
Sae-20w
SAE 10w30
Prescribed in the owners' manual is SAE 20W-50. The nearest best grade to use is SAE 15W-40.
Manufacturers mix various oils to make an 'SAE 40' oil product. Such a mixture will not have a molecular weight.
SAE 5w40 full synthetic oil.
SAE 30 motor oil if the temperature is between 30 & 75°F.Colder use SAE 10 oil.Warmer use SAE 40 oil.
SAE 10w30 synthetic.
No ( according to the owners manual that came with my Ariens lawnmower ( with a Kohler engine ) SAE 30 if above 40* Fahrenheit SAE 10W-30 if below 40* Fahrenheit