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Have the engine at full operating temperature and on teh jiffy stand and then remove the oil tank filler cap clean it off, reinsart it and then pull it out again and look at the dipstick tpo see where the oil is on the marking. DO NOT EVER OVERFILL BY EVEN A SMALL AMOUNT.
Your oil will expand and push out of the oil tank if the cap is not sealed. That is why there is an o-ring on the cap. You must have it sealed in order to keep oil from leaking out of it.
If the tank cap is loose, you need to get a new seal or simply replace the entire cap. There are two marks on the dipstick. The upper mark is "FULL HOT" and the lower mark is "FULL COLD". Do not add oil to the tank when the oil is cold. As long as there is oil on the stick, ride the bike until it comes to operating temp and then add any oil if it needs any. This is a common mistake on the Sportsters. If you bring the oil up to the top mark when cold, it'll expand and blow the tank cap out and make a big mess. Do not overfill the tank but if the tank cap is loose, replace it.
Maybe being that he was a "Stortster rider" that's why he used it?
I wouldn't put anything like that in the tank. No telling what results you may get when it contacts the parts in the system. Possible he was pulling your leg?
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