Used a mobile mechanic pre-purchase inspection service before buying a used car. The mechanic came to the seller's home, checked everything on-site, and found some hidden problems. He saved me from a bad purchase. Super convenient and totally worth it.

Hey folks,
I was told during my last service that my car might need a car engine oil flush. I've never had this done before, and I don't know if it's really necessary or just a way to increase the bill. Has anyone done it? Has it helped? I'd love to hear your thoughts or experiences.