12-10-2022, 07:29 AM
You laugh, but my nutcase brother-in-law marks his oil filters on his cars before taking them in for an oil change. 
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I don't blame your brother-in-law. I did a tune-up on my father's GM car that had a V-6 engine turned sideways several years ago. You had to go through additional work to unbolt motor mounts, and then pivot the engine forward to access the rear three spark-plugs. When I removed the three rear spark-plugs it was very obvious that they were the original three the car came with because they were extremely worn and old looking, while the front three looked normal (very little wear). My father had the car tuned-up by the dealer about two years prior, and it was obvious that they never replaced the three rear spark-plugs, although he had been charged for it. I was furious, and wanted to confront the dealer who did this to my 80+ year old father, but my father talked me out of it. I could sight more examples where I personally know people who were ripped off by dealers, but I won't get into that.
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I don't blame your brother-in-law. I did a tune-up on my father's GM car that had a V-6 engine turned sideways several years ago. You had to go through additional work to unbolt motor mounts, and then pivot the engine forward to access the rear three spark-plugs. When I removed the three rear spark-plugs it was very obvious that they were the original three the car came with because they were extremely worn and old looking, while the front three looked normal (very little wear). My father had the car tuned-up by the dealer about two years prior, and it was obvious that they never replaced the three rear spark-plugs, although he had been charged for it. I was furious, and wanted to confront the dealer who did this to my 80+ year old father, but my father talked me out of it. I could sight more examples where I personally know people who were ripped off by dealers, but I won't get into that.