There is a rather detailed post about tetraethyl lead usage about 6 months back. You do NOT need to use lead additive. Period. Remember, a good number of the F series and Letter series tractors were dual-fuel capable. Kerosene and distillate did NOT have lead, and when using these fuels, the engines ran alot hotter.
All tetraethyl lead did was to increase the octane rating of the fuel. This was done to allow higher compression and prevent pre-ignition of the fuel/air mixture. Lead build-up on valves was a problem when lead was used in gasoline. All letter series tractors are relatively low compression, low RPM, high tourque engines. The do NOT require high octane or lead additive.
I usually will add IMHO (In My Humble Opinion) to this type of post, but in this instance, I won't. There is no "opinion" involved in this one! :wink:
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