ENGINE MAINTENANCE - Engine Lubrication and Filter Intervals CAUTION will decrease the engine life due to factors such as corrosion, deposits, and wear. Engine oil filters capture dirt and remove deposits from the oil to prolong the life of internal moving com- ponents. Follow the oil and filter change intervals as recommended in this section of the manual. Failure to comply may result in equipment or property damage.
Extending the oil and filter change in- terval beyond the recommendations 2 Determining Type of Vehicle Application for Engine Oil Drain Intervals Y53-1166-1G1 (08/2018) 41 Severe Duty - Vocational * Normal Duty - Line Haul Fuel Consumption Less than 6 MPG (2.6 km/L) 6 MPG (2.6 km/L) or greater Gross Vehicle Weight Greater than 80,000 lb. (36,300 kg) 80,000 lb. (36,300 kg) or less * Vocational vehicle applications include: Agriculture, Concrete Mixers, Construction, Crane, Dumps, Emergency/Fire, Heavy Equipment, Loggers, Mining, Oil Field, Refuse, Pick-up & Delivery, Snowplows, and Wrecker.