Recently I did a routine pm on some modular chillers. Each one has a 40 hp recip compressor, the standard low and high pressure safeties, and no oil safety control. This seemed odd given the cost of a compressor replacement. Looking at the IOM it lists the control as an option. This job is only about 5 years old. The question I have is this, do I sell the customer the upgrade or do I put my blinders on like the other technicans before me and not mention it? Your thoughts.