Perform Transmission Fluid Service By ‘Severe Duty’ Change Intervalby AutoCarePro Team - Nov 18, 2014 Improved lubricants have allowed service intervals to extend for many vehicles with automatic transmissions, utilizing “lifetime fluids.” In the past, service recommendations for automatic transmissions were based on time/mileage tied to requirements of new vehicle warranties (2-3 years or 30,000 miles). Lifetime fluid recommendations are now 5-10 years or the life of the vehicle (100,000 miles) unless the vehicle is subjected to “severe duty.” The question that often comes up next: When is it appropriate to perform a fluid service? Taken directly from OEM owners’ manuals, “severe duty” has historically been defined as: • Operation o ... read more