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2018 BMW

X3 M40i

Auto (S8), 6 cyl, 3.0 L, Turbo

BMW X3 M40i: best and worst years
2018 BMW X3 M40i

Closest available photo (2019 model year); you're viewing the 2018.

2019 photoCalreyn88CC BY-SA 4.0via Wikimedia Commons

Overview

Body
Small Sport Utility Vehicle 4WDEPA, from EPA, last updated 6/22/2026
Transmission
Automatic (S8)EPA, from EPA, last updated 6/22/2026

Engine & performance

HP
355
Power to weight
0.084 hp/lb
Axle ratio
3.38

Efficiency

Smog score
5/10
Real-world MPG
24.8 mpg, reported by 1 driverabout 1.8 mpg above the EPA combined estimate
SmartWay certified
No

Dimensions & capacity

Safety NHTSA record NHTSA, model year

Recalls
0
Owner complaints
0 See on NHTSA

Warranty manufacturer terms, by make

Basic
4 yr / 50k mi
Powertrain
4 yr / 50k mi
Roadside assistance
4 yr
Maintenance
3 yr / 36k mi
EV battery
8 yr / 100k mi

Source: bmwusaservice.com as of 2026-06

Information is gathered on a best-effort basis from public sources, may be incomplete or out of date, and is not purchasing or financial advice. Verify with the manufacturer or dealer before buying.