So I took my truck to an auto repair shop for the first time in 7 years to have my rear main seal replaced because I didn't have the equipment or time to do it myself. So now my piston rings have shattered and are through my entire block. Note: My truck has had an oil leak for a while and I just kept putting oil back in it and my truck ran just fine before they "fixed" it. They said they checked the oil when I got it towed to their show and it was too clean so they suspected that my oil pump went out etc. etc. Is there any way that fixing the rear main seal leak could cause this? Or anything the mechanic did to cause this? Please I need answers. My dad and I built the engine ourselves and if they broke it they are going to fix it!

 

Replacing the "rear" main seal could NOT possibly have trashed your rings. Does it run at all? Why would you have it towed to them if it ran fine?

 

The whole thing sounds fishy to me. Here's a little story about something that happened at a shop I worked at, many years ago.
Had a car with a cracked oil pan(aluminum). The pan had been removed and the car was on the lift but the lift had been let down for the night. The shop helper/clean-up guy was the first in and had moved all the cars outside so he could sweep the shop. Nothing unusual as he did this on a regular basis. As luck would have it, instead of leaving this car on the lift he decided to move it also. As it was the last one to be moved he decided to take it to make a doughnut run. Long story short, the customer got a new engine for their XK-150.

 

Oil rings don't just "shatter". If the oil pump didn't work, the motor would have locked up very quickly(like minutes of running).

If they found broken oil rings in the oil pan, then something was amiss when you assembled the motor. It would also smoke like a train and/or have very low compression.

If you were constantly putting fresh oil in, that is the reason why it was so clean when they checked it. Nothing wrong with clean oil.