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Message: <blockquote data-quote="Shadowrider" data-source="post: 3603591" data-attributes="member: 3099">I ran propane on an old F150 for years. Propane and NG don't hurt an engine that's new enough to run unleaded fuel, it's the older ones that don't have hardened valve seats that don't do well. Well there is one issue. If it's a carbureted engine it'll dry various seals out in various places if you don't switch it over and keep fuel in the bowl and run it on gas regularly.Mine ran so clean I eventually ended up with 7 non-foulers in it. It was that worn out and I had quit changing oil altogether. No real need when you are adding 2 quarts a week. <img src="/images/smilies/biggrin.png"  class="smilie" loading="lazy" alt=":D" title="Big Grin    :D" data-shortname=":D" /> There's no way it would have went nearly that long on gas.</blockquote>