Ok its been quite a while since i posted about this... My opinion after using it for long time is if you have extra weight in your car, & or live in hilly place (i have both) it's my advice to use lead additive in every tank esp if your engine is running a lil off with no other obvious cause, have to keep adjusting valves due to valve sink. My 72 B20 wagon full of junk has been running very well with no valve sink for long time now because i use lead additive. Normal use of your car probably wont need lead additive, but you may want to use it anyways if your towing or heavy load...
my 2 cents worth.
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