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NO THERE won't be any adverse effect on your engine, and with sequential vapour injection you won't notice any difference in performance. You can use an upper cylinder lubricant for a little extra protection as LPG is drier and therefore harsher on valves and valve seats than unleaded petrol, but it's a precaution rather than a necessity. Running the engine on petrol once a week will prevent the seals in the fuel system from drying out and hardening.
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