I was told by a Lycoming rep many years ago that if I was going to run
auto gas in my O-320 powered Super Cub, I should blend it 3 parts auto gas
to 1 part 100LL.  The reason is that 100LL contains 4 times more lead than
80/87.  By blending down the 100LL with 3 parts auto gas you end up with
an equivalent amount of lead as 80/87 which reduces the chance of lead
fowling of your plugs but keeps some lead to lubricate the valves.

I've done this on and off for years and have had no observable problems.

The rep also told me that those operating P&W R-985s (Beavers) should
blend just the reverse; 3 parts 100LL to 1 part auto gas.  I think he told
me the radials need more lead for lubricating the valves.

Yes, the smell of auto gas is terrible.  I no longer use auto gas since I
purchased a hangar and keep my plane inside.  Walking into my hangar
filled with auto gas smell would nearly make me want to turn around and
walk back out.

Jim Thomas
L2K #166

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