8-71 blowers
 

I know i am suppose to use non synthethic oil but i cant rember quanity and viscosity can anyone help? -----I think its 14oz of 80w

Don't know why you'd not want to use synthetic. I'd call the people who built it. Each manufacturer has a different setup and procedure for fill. They all use a level-hole. Some have a dedicated hole, others have you pull a specific cover screw and fill to that point.

Joe,
Chris is correct. TBS and DMPE both recommend Red Line Shockproof 75W90 in their blowers. Looks like pepto bismol, works great.
That's all I use in mine. Not only are the gears and bearings under load, but gas intrusion and oil breakdown is a problem with any blower. The synthetics stand up better to gas dilution without breaking down.
I have also used Royal Purple 75W90 Max Gear.
Steve

In thinking about this, here's what may be the issue. Years ago when synthetics were first coming onto the market, they had chemical properties that would cause seal swelling. People would use synthetics- for example in an engine. Then if they went back to petroleum-based lubricants, their engines would start leaking. These issues have all been solved. Synthetics no longer have seal-swelling issues and the materials in modern seals are less susceptible to external chemical effects. Now, if your blower is 30 years old and has old seals, it needs to be re-sealed. Keep in mind, all that's in the drive is a simple set of spur gears. Synthetic isn't going to have any effect on them.

I called The Blower Shop as I could not remember the recomendation that I was given a year ago or so,
old recomedation was 70/90 non synthetic - 14oz.
new recomendation is 70/90 of semi synthetic - 14oz., they said the reason for the change is that the non synthetic oils now dont contain the same properties they did a year ago.