Do shops still sabotage cars for profit?

To sum it up, we have established the fact that the car has to be looked over very well in order for the technician to cover his rear so the customer can't say he neglected to find an issue with the car, yet the customer is usually so sceptical that they think you are trying to sell them things they don't need although you are just alerting them of possible issues that may need adressed now or in the future.

The thing that sucks is when you get customers that ignore your stern recommendations of necessary repairs because they are too cheap to fork out a few bucks, then your warning becomes reality for them a couple days or weeks down the road and they come back crying for you to give them the deal of the century.

Man, I can't even begin to tell you how many different scenario's I have had regarding this, but YES, extensive documentation is the key to covering your arse, and also explaining to customers that you don't have a crystal ball to forsee problems down the road is sometimes next to impossible when dealing with idiots who want to drive a highline car yet can barely afford their mortgage payment.

Oh wow, 'spaz, for everytime I've heard, "well, my car was in here a little while ago and you fixed a headlight and now my check engine light is on..."
Hard to hold your tongue in a situation like that. For the life of me I want to look at the person and tell them that I'm not Harry Potter, I don't have a magic wand to wave over the car and cure every problem the car will ever have when you came in three months ago for a blown light. Now you have to take the time to explain to the customer that a blown headlight has nothing to do with an gross evap code. After you pull the paperwork you find out that it's been three months since the last time you saw her and that a lot can happen in three months. But she will always argue that it was just last week, even though the closed RO shows that a headlight was put in and paid for three months ago, it's all your fault because you had to have done something to the car! Even though the gas cap is broken and it's at the other end of the car from where you worked on it last time.
Or when the guy comes in and has an estimate you gave him a month ago and wants another estimate and then acts surprised that the exact same thing is wrong and it costs the exact same amount of money as a month before. Like he expected the car to some how have fixed itself and wouldn't need the same parts and labor. Or he expected the parts and labor to have gone down in that interval.