Since you only run 150 miles a on the car you have to change the oil by time. Once a year or every 6 months depending on what you prefer.

I don't drive my SDL that much anymore and change the oil every 6 months regardless of mileage. Lots of collectors do this as well.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200