100VLL Vs 100LL

[Tom Downey]

Knowing they look the same, how do you know which you are running?

[rosiejerryrosie]

Since both are approved, does it make a difference?

[Joe Delene]

Doesn't matter, the new designation of 100VLL is just lowering the allowance of lead to what's actually used today. Just about any 100LL already meets that new lower level. It's just a regulation adjustment, no real change in lead content.

Read the AOPA brief. The new '100VLL' designation just lowers the max lead content by 20%. That is in line with the actual lead in todays 100LL. That means there is virtually no difference from the 100LL you pump today. It will be fine for all engines that currently use 100LL.

If you have plug fouling problems I'd search for another solution. I'd maybe consider going 50% or so with non-ethanol 91-93 octane auto/boat fuel. You should test it, don't trust the sticker on the pump. That's just me, YMMV.

[Seerjfly]

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[Tom Downey]

Doesn't matter, the new designation of 100VLL is just lowering the allowance of lead to what's actually used today. Just about any 100LL already meets that new lower level. It's just a regulation adjustment, no real change in lead content.

It matters a great deal when you have an engine that was certified on 73 oct, and fouls plugs on 100LL, with up to 39% less lead in vll I'd like to see what it does using it.

[Tom Downey]

VLL is half price ? :D Dream on..