Oil change places do not hire people with technical acumen. They hire warm bodies. I know this because my 50-something neighbor who can't change the belts on his riding mower worked at one. Additionally, I work in the insurance business and we get a regular stream of claims from those chain 'under car professionals' places like Jiffy. The absurd thing is, if you are getting work done other than a simple oil change, you are paying almost as much here locally as what a dealer charges. People think they are saving money going there but they are not. Same labor rates, cheapest parts they can find and hacks who couldn't get hired anywhere else.After having one of those Jiffy Lube services strip the nut on the oil filter housing of my F250 Diesel, I will never let anybody touch my vehicles for basic service again. I had to replace the whole housing, and man was that a pia!