Are you certain you want VERY light weight (low viscosity) SAE 20 GEAR Oil
SAE viscosity numbers for engine
oils and gear
oils are on different scales*.
20 weight Oil is roughly
equivalent to SAE GEAR 80 weight.
* The two systems (engine oil and gear oil) aren't directly comparable, number-for-number. Here's a reasonably accurate comparison between the two systems. Please remember that I said "reasonably accurate", as there is some overlap.
SAE Engine Oil ≈ SAE Gear Oil
10w thru mid range of 20w ≈ 75w
Mid 20w thru mid 30w ≈ 80w
Mid 30w thru low 40w ≈ 85w
Low 40w thru 50w ≈ 90w
60w up ≈ 140w