Quote:
Originally Posted by mreid
Take all that money you spend on additives and put it in the bank. Use fuel with an appropriate octane rating to avoid pinging under load. Drive and have fun. If your iron heads do not have hardened valve seats (at least on the exhaust side) and ss valves, by the time you suffer valve seat degradation, you will probably have suffered life degradation and won't care. Like I said, drive and have fun!
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100% correct. All those additives are nothing more than, pardon the pun, snake
oil. The only time I've ever seen valve seat recession without hardened seats was in a boat motor. Boats, motor homes and other engines that operate under heavy loads for long periods of time need hardened seats.