hello there friend a fellow emgineer speaking to you. I repair and operate petrol driven machinery most of the time so have a method of determining my oil levels and changes of oil. for oil refills get a piece of thin plastic which is reasonably long and send it into the oil tank to the bottom. once done so get some electrical tape and make a raised bump at the top where the rod is exposed at the lid. then with a knife blade make a series of scores into the plastic. again the same if you want with a piece of metal. thin sheet metal should do. but this one will use a piece of cork as an adjustable stop. this means you can place the rod into the tank of choice and adjust the sliding cork which will be a nice tight fit down or up the rod to match the depth from lid lip to base of tank. I have one for my pro machines and a seperate unit for my chainsaws which require chain oil refils on a regular basis lew
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