lets get this straight if using a tube to check from fill point to surface of oil it does not give a true readout and I should know. not wishing to pee on anyone's flames here but using a depth rod or "dip Stick" tells you your average oil load from the base of the engine to point of fill requirement. you would need to find out this anyway as sometimes engine oil can go off or become affected by water etc or even to determine other issues like too much fuel mixing etc on certain engines. your senses tell you more than you think they do. a petrol mower of mine is a big beast. its a ransomes autocertes. the engine on it is a briggs and stratton vanguard engine as an enhancement. the engine has an intake from fuel to the piston relay and the decompression chamber on it and it has been known on older vanguard engines that fuel can show in the oil and cause cracking in the aluminium casing of the engine block and warping of the piston head and shaft. also damage to the pivot seal and flywheel seal to the magneto circuit. I'm thankful that my machine has not had that problem and I always check the oil for noticeable impurities and irregularities. I will say this now and once. engine maintenance for blind and visually impaired persons is tricky and complicated if you don't know what you are doing and the specification of engines concerned. get to know the engine by feel, listen for obvious signs that are not normal and really inspect it before even servicing. there are courses for engine restoration work and are worth looking at so to speak. lew
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