Diesel Exhaust Fluid has an expiration date, after which it becomes far less effective and can even damage your engine.
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15 Things You Should Never Do To Your Car

All cars have a “low oil pressure” warning light. If the light comes on while you’re driving, it can mean that your car is ...
Will this winter bring milder temperatures with fewer snowstorms? We certainly hope so, but fleets still need to be prepared for the worst by properly winterizing their vehicles.
Oil dilution is a common occurrence on modern diesel ... Any fuel, including low-grade, is susceptible to condensation due to temperature fluctuations, which can also contribute to oil dilution.
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