To build upon what Benzmac said, you should go to a calendar based maintenance plan, not mileage based. Oil change 4 times a year, heavy maintenace once a year regardless of mileage. Drivng a car only once a week is fine. The key t to get it fully warmed up when you do drive it so all moisture in the crankcase "gets boiled off and all moisture in the exhaust gets purged. Also get a back door and enclosed parking so your boss will not know when you play hooky!

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Deezel
87 300TDT
150,000 miles