How often should the transmission fluid be changed for a BMW 3 Series?
2 Answers
For a BMW 3 Series, the transmission fluid should be changed approximately every 2 years or 60,000 kilometers. There are two methods for changing the transmission fluid: gravity drainage and machine-assisted fluid exchange. Taking the 2021 BMW 320i as an example, it is a mid-sized 4-door, 5-seater sedan with the following dimensions: length 4719mm, width 1827mm, height 1459mm, wheelbase 2851mm, and a fuel tank capacity of 59 liters. The 2021 BMW 320i is equipped with a 2.0T turbocharged engine and an 8-speed automatic transmission, delivering a maximum power of 115 kW and a maximum torque of 250 Nm. It features rear-wheel drive, with a double-joint spring strut front suspension and a multi-link independent rear suspension.
I've been driving a BMW 3 Series for several years and always change the transmission oil on time. Generally, it's safest to change it every 4 to 6 years or 60,000 kilometers. Aging automatic transmission oil can affect lubrication and cooling, leading to rough shifting or accelerated wear of parts. I've seen friends who didn't change it on time end up spending a lot on transmission repairs. I recommend regularly checking the oil color: it should be light yellow and transparent. If it turns dark brown or has a burnt smell, it needs immediate attention. Those who drive frequently at high speeds or often in congested city traffic should shorten the interval to extend the lifespan and performance. The maintenance cost of a few hundred dollars isn't expensive compared to maintaining a smooth driving experience—don't save small money only to suffer big losses.
