Quote Originally Posted by AtcMan4Life View Post
Ok so I figured regular non synthetic 10w-40 would be fine in these???
I don't recommend synthetics in the older four strokes. Below was copied straight from Powroll who does extensive testing with motor's.

"Petroleum oil seems to have an advantage over synthetic in how it sticks to the metal, and protects metal to metal contact areas better.
This is especially helpful in older style four strokes where you have many of high pressure metal-to-metal contact areas - cam and rockers, cam and head, etc."

If you want to read more about what oils to use go here: http://www.powroll.com/tech_specs_OIL.htm