An MOT emissions test for LPG Etc, is performed differently to petrol . The engine is run at a set number of revs to purge the engine & visual check for smoke made & then the probe is used to read the output from the exhaust . It differs greatly from petrol tests . An oily film should not cause any problems , unless it is dripping from the tail pipe .
Might not be 100% accurate , as I have not performed one recently , do not see too many LPG vehicles
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