I've been to five auto parts stores, three big-box stores, and two ATV shops looking for bronze-friendly gearbox oil. No luck.

So it's down to ordering gear oil online. Amazon lists two gear oils that say they are yellow metal safe, and I'm wondering if anyone has experience using either one of these products, or has another recommendation. If they SAY the product is yellow metal safe can I depend on that?

Note that the Red Line product is "full synthetic". Is that suitable for '69 T120R gearbox?

PJ1 11-90 Hypoid 90W Gear Oil, 1 L

Red Line (50304) MT-90 75W-90 GL-4 manual Transmission and Transaxle Lubricant - 1 Quart

Also, is all fork oil synthetic? That's all I seem to be able to find. Is sythetic fork oil ok for 60s vintage forks?

Bruce Miller
aka The Hermit
The Bonnie Ref: https://www.hermit.cc/tmc/om/manual.htm