Originally Posted by RichieST
The petrol will deteriorate the rubber seal in the dowty washer pretty quickly. The trick is to use new copper washers and just nip them up, do not crush them. Once they are flattened they are useless!
My mates had them on his saph for years, mines been on there for a year and no leaks, my mates rst has them on it for years with no problems and it's been fine. There designed for the use, u can get dowty washers with different rubber in, u need the ones that are used as sump plug washers from the peugeots there oil and fuel resistant. In fact the ones on my mates saph have been on there at least 5 years to my knowledge as I've changed the filter everytime I've serviced it.