Want this question answered?
Yes, and I highly recommend you use synthetic in any air cooled engine. Use SAE 10W30 or SAE 30 weight.
You can use any kind of 10w-40 oil for a nighthawk
Baby oil
Most use Synthetic Oil.
Rocket oil
They use the oil God gave them in their oil glands.
synthetic oil
What are you substituting the oil with? What kind of recipe? You couldn't use butter for the oil in salad dressing. Sometimes it does matter what kind of shortening you use.
Olive oil.
engine oil
fully synthetic oil
A flavourless cooking oil.