Liquid cooled VW cars tend to have their plastic dipsticks and tubes fall apart, sadly, those are expensive dealer items only.
Also, about overfilling with a bulk oil dispenser; I once had that happen, and a GM 3.8 came back with 7 quarts of oil in a 4.5 quart sump. The oil gun seemed fine, but it failed 100% the day after I worked on that GM3.8.
Overfilling an engine causes vibration in multiple ways. The high oil level causes the crank to hit oil and slow down, and that extra oil upsets the balancing that was done to the crank at the factory. Also, when the crank hits the oil, it becomes foam, and foamed oil has lower oil pressure because air can compress. Other times, excess oil gets sucked into the PCV system, causing oil to get into the combustion chamber, where it upsets the air/fuel mixture, and combusts inefficiently.