that is a good question. My friend is a machinist and engine builder, He told me that older motors that at one time ran on leaded fuel are now safe to run on unleaded fuel. due to the fact that lead has penetrated and embeded the valves as well as the old seats, He said it could be a problem if the motor was driven for long highway miles non stop I meen realy pushed hard. I have a 86 xt and I run unleaded with no additive so far no problems.
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