My understanding is that the non-lead fuels do contain additives which
adequately lubricate the valve stems. The reason TEL was added to fuel in
the past was that the lead provided lubrication to the valve stems under
high heat conditions. The problem was the lead would built up on the back of
valves. Can't tell you how ugly some of those valves looked during an
Newer vehicles also have valve stems and guides of different material now
that don't need as much lubrication as in the past. If it were mine I
wouldn't worry about it and would just use unleaded fuel without any
additives. I've been told the additives are a joke and just a way to get
more coin from your pocket. Good luck!
You might want to have a read of this:
We have a 82 230E and run premium unleaded with octaine booster and the
makes the engine run a little hot but you get a much smoother ride and
slight performace increase over the Lead Replacement, which frankly is just
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