From:Dave Hennessey
Subject:RE: RE: What 2-stroke oil ?? Date:Tue Sep 24 00:32:36 2013
Response to:18811
There are lots of differing opinions on this subject - here's mine:

Harley's Two Stroke oil was SAE 40 - it even says so on some of the cans (see picture below). Today, SAE 40 is getting hard-to-find, but SAE 30 is still available.

Two-cycle oil for chain saws and weed wackers (from the hardware store) is similar, but they have more additives in it. Additives are not bad - there have been a lot of advances in motor oil technology in the last 50 years. Consider that multi-viscosity oils (like 10W-40) were not even invented until 1954!

However, you should avoid 2-stroke oils marked TC-W3, as these are made for SeaDoo's and other water-cooled engines.

Does it really matter? If you weight 275 pounds and are driving your Hummer up and down the Rocky Mountains every day, then yes. If you drive it around the neighborhood every few weeks - not really.

I buy hardware-store chain saw and weed-wacker oil, and mix up 2 gallons (at 24:1) each spring. This usually lasts me through the year. I tend to put an extra drab of oil in the can, so it probably ends up being closer to 20:1.

A little rich with oil causes more smoke and might produce more carbon, but I took my muffler off recently for the first time in about 8 years, and there's no carbon buildup.

What you really, really, don't want to do is make it too thin with oil. This is inviting disaster.

Over the last 30 years, I've abused Hummers by using any and every kind of oil in the gas. It hasn't seemed to matter much. Just be sure you give it enough...


You do not want to use 2-stroke oils marked "TC-W3".

I had bookmarked this link
from a member's post regarding oils.

Hope this helps.

I have an original '53 model 165. I've been told NOT to run the common
2-stroke oils you commonly find today as they are SYNTHETIC and may
damage the engine. Same friend told me to run BLENDZALL castor oil.
Can someone help/advise me on this. What should I run ??