If this mechanic is getting video from inside the cylinders with a borescope, doing compression tests on all cylinders, pulling diagnostics from the OBD interfa

If this mechanic is getting video from inside the cylinders with a borescope, doing compression tests on all cylinders, pulling diagnostics from the OBD interface, checking seals and joints, checking that emissions would pass in my state at least via OBD and signing their name on a form then I certainly would. ... especially on cars that pulling the plugs requires removing the fuel rails. I would also expect them to take it for a rough ride and see how it handles. Avoiding traveling cross country just to find that the vehicle is a pile of junk is worth much more than $125 in my opinion, assuming this system can't be gamed and assuming they are doing the above checks.