They will mix together, but only use it in an engine if it is an approved combination of oil according to the manufacturer.
SAE 20w50 100% synthetic oil.
SAE 50 is a single weight oil that is 50 weight when cold or hot. SAE 20w50 is a multi-grade oil. When cold it flows as a 20 weight oil and therefore flows much easier. At full operating temperature it flows as a 50 weight oil. The W stands for winter.
SAE 20w50 synthetic.
if using your bike in the summer use sae 20w50 but for starts below 50 degrees use sae 10w40
According to the Kawasaki site you should use SE class SAE 10W40, 10W50, 20W40 or 20W50 oil for the engine. You use SAE 10W oil for the front fork.
NO no, you will ruine trans.
To add the sae 10 non detergent oil to your furnace blower motor you will have to open the motor section.
The recommended viscosity grade for use in all temperatures is SAE 20W50 for your 2008 Heritage
SAE 30 motor oil if the temperature is between 30 & 75°F.Colder use SAE 10 oil.Warmer use SAE 40 oil.
SAE 20W40 type SE motor oil for > 40deg F SAE 10W30 type SE motor oil for < 60deg F
SAE 10W30
sae document j300 defines the highest single grade as 60. this is in reference to viscosity and not the quality of the oil