Will Transmission Fluid Expire If Not Changed for 5 Years?

[DePatrick]

Yes. If transmission fluid is not replaced within the recommended interval, its quality and performance will deteriorate, leading to increased impurities. This accelerates wear on transmission components, causing premature failures or higher failure rates. Below are additional details: 1. Primary functions of transmission fluid: Maintains cleanliness of the gear system while lubricating transmission components to extend their service life. 2. Replacement intervals: Manufacturers typically recommend changing transmission fluid every 2 years or 50,000 kilometers - whichever comes first. For example: • Vehicles used for 2 years but driven only 20,000+ kilometers • Vehicles used less than 1 year but already driven 50,000 kilometers Both scenarios require transmission fluid replacement. For new vehicles, first replacement at 50,000 km is advised. Subsequent intervals should adjust based on driving conditions: • Good road conditions: Replace every 70,000 km • Poor road conditions: Replace every 30,000-40,000 km This practice extends transmission lifespan and reduces failure rates.