Ok so I did the test MF described on a piece of cardboard, straight petrol, his fuel and 25:1 mix. After an hour could not see the petrol, his fuel left a slight stain and the 25:1 left a decent stain so I'm figuring he may have added oil but maybe at about 50:1 I should have got an endoscope years ago, just never got around to it.
speedy, good call I hadn't thought about Cash Converters
Tyler, you always have an angle on everything, things I would never have thought about
AVB, there is always something out there to trip you up but I think the fuel on the cardboard trick must be fairly accurate
I haven't thought about testing for oil myself here. Most around here packs meant for 1 gallon containers. There is always someone that try going el cheapo that get them in trouble because they don't measure accurately.
As the endoscope it took me a while to find one that would fit in those 10mm spark holes. Very few I look at would even come close. I am however disappoint that they went the cheap route for the right angle mirror. It was a piece plastic with foil backing and it didn't even work so checking those cylinder is not easy as it should be.
