I change mine every fall before my car goes into storage for 4-6 months. Just because thats how I have always winterized boats so I carried it over to the SDL. I figure that the 603 isn't much different then a diesel in a boat.
If I didn't store the car I would probably just change them at whatever mileage the FSM indicates.
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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200
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