I used to have a friend who claimed to be an expert on working on car engines.
He was able to get my jeep engine fixed and he even refilled the AC compressor so the AC system was working again. All we needed to do was use some refrigerant so that we could refill the AC compressor, but I was happy about my climate control working and I had him work on my cars over the years. He did alright for the most part, but he really made me mad with the last 3 vehicles I had. I had this nice SUV that worked fine for awhile until I had him change the oil. It turned out that he got the wrong oil filter for the SUV and the oil pressure went practically down to nothing. He claimed that all those oil filters were basically the same and it should work fine. He even insisted that I continue to drive the car even though I felt it was struggling. I should have listened to my gut, but that car was no longer running after a couple of weeks after that oil change with the wrong filter. Then he said he could fix the engine and asked me to buy a bunch of different parts he needed. Well, all this time went by and he never fixed the thing. In the meantime, I bought this cheap van that lasted me a long while, but I never let this guy change the oil in any of my vehicles anymore. I did end up getting a car from a shady dealership. I should have checked the oil but the oil was dry even though there was a fresh oil change sticker on the windshield. I ended up taking them to court and sued them for selling me a lemon.