Niagara Gazette — In all of my recommendations regarding drain intervals for engine oil, I always recommend following the severe svc schedule, which these days is 4K to 6K miles between changes. Normal drain intervals run 6K to 7,500K, or follow the oil life monitor if your vehicle is so equipped.
Now let’s look at service applications for the other fluids in your vehicles. But first let’s look at the definition of severe and normal service descriptions.
You drive under severe operating conditions if you:
• Drive frequent short trips weekly, say to the store and back or to work and back all under 10 miles
• Don’t drive the vehicle long enough for the engine to completely warm up to operating temperature
• Drive the vehicle heavily loaded or towing a heavy load all the time
• Operate the vehicle in dusty, dirty environments often (like construction sites, road construction or dusty dirty environments)
• The vehicle is operated mostly in stop & go situations like in city traffic or a delivery route all day
You drive under normal operating conditions if you:
Drive the vehicle at least 20 miles a day at highway speeds
• Operate the engine long enough to thoroughly warm it up along with all the other drivetrain/powertrain components
• Seldom haul heavy loads or tow with the vehicle
• Operate the vehicle at highway speeds in a clean environment
And now for svc recommendations of each fluid in your car.
The transmission fluid performs a few functions. It serves as a medium by which the hydraulic pressure, necessary to operate the transmission is created. It absorbs heat within the unit and carries it away to the transmission oil cooler insuring that the trans does not overheat. It lubricates the moving parts inside the trans. Finally; it keeps dirt in suspension until the trans filter filters it out. The trans fluid is oil and therefore subject to viscosity breakdown and loss of protective, lubricating and cooling properties. Leaving the transmission to operate on fluid that is worn out will result in premature transmission wear and failure.