I used to get scamed back in the day on shit like this cuz I am clueless on the mechanics of a car.
I took the advice of a friend about 10 years ago, always take your car to the manufacturer dealership of the car you own if you need major work done, regardless if you brought it their or not.
Yes you have to pay more, but they will not let that car leave the premisis' if it has a major problem when it came in.
Also if they discover other items that need attention, they will list them to you and discuss them with you. They will categorize what is important and what isnt so that way you can come back at a later date for repairs when you have the funds. They do not want repeat business, they want to improve their brand so you will come back later and trade that old car for a new car from them. Thats where they make their money.
Bring your car to the dealer for their major service plans like the 60K, 90K, 120K etc....This will keep your car running good and keep your maintenance low. Also they will have a maintenance record of your car in their system and can give you heads up in the future if items need to be repaired/replaced before they fail.
Taking your car to Jiffy Lube, Valvoline, Walmart, Goodyear, Firestone, etc....you gonna have problems cuz they depend on repeat business and will set your car up for failure.
Just a tip...........