FWIW, I love the M103 but I am not the biggest fan of CIS, so I am converting my car to Megasquirt II. The 3.0L engine I have going into the thing has more than 200K miles but passed a leak down test with flying colors. The 2.6L engine I have in the car currently has 207K miles and doesn't burn or leak a noticeable amount of oil between my 4K mile oil change interval. I did finally get the CIS working pretty well on that engine, replaced the injectors, plugs and wires, distributor and rotor, O2 sensor (which was throwing codes but I don't think was bad), EHA, air flow meter potentiometer, and finally reflowed the solder on the OVP relay which solved the issues that started a couple weeks after the air flow potentiometer replacement.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.