BMW 3 Series trim comparison
2026 BMW 3 Series M340i xDrive vs M3
The 3 Series M340i xDrive starts at $64,300 while the M3 is $79,300. That $15,000 gap buys 7 meaningful differences.
This is a powertrain and drivetrain change. The M3 gets the 3.0L I6 Turbo and RWD, so the $15,000 is buying a different driving experience, not just nicer trim.
This is a real hardware fork, not just a trim-label shuffle. The M340i xDrive is enough if the 3.0L I6 mild-hybrid Turbo with AWD already fits your routine; the M3 only earns the jump when the 3.0L I6 Turbo and RWD setup is the point of the upgrade.
If you are budgeting this move monthly, the jump from the M340i xDrive to the M3 is about $264/month on a 60-month loan at 6.5% APR with 10% down. That works out to roughly $15,840 more by the time interest is counted. If that different powertrain is not part of your real use case, the cheaper trim keeps more money in your pocket without changing the core experience you need.
Lock one trim, change the other side, and move through exact pair pages without resetting back to the full lineup every time.
Who notices the difference
The higher trim starts to make more sense when you are specifically shopping for the stronger powertrain, not just more trim content.
When both feel the same
Same platform and drivetrain options on both trims.
The upgrade math
You are paying $15,000 for 6 measurable differences, which works out to about $2,500 per change.
Key Differences at a Glance
This is the fast read: price, power, efficiency, and the feature flips most likely to change the answer.
Every Difference, Side by Side
This is the full read behind the quick decision signals above: the complete hardware, comfort, and equipment story. 7 specification differences, 0 shared.
Full Specification Comparison
Specifications reflect available data as of early 2026. Confirm details with an authorized dealer before purchasing.
| Spec | M340i xDrive | M3 |
|---|---|---|
| Pricing | ||
| MSRP | $64,300 | $79,300 |
| Powertrain | ||
| Engine | 3.0L I6 mild-hybrid Turbo | 3.0L I6 Turbo |
| Horsepower | 386 hp | 473 hp |
| Torque | 398 lb-ft | 406 lb-ft |
| Transmission | 8-speed shiftable automatic | 6-speed manual |
| Drivetrain | AWD | RWD |
| Fuel Economy | ||
| City MPG | 26 | 16 |
| Highway MPG | 33 | 23 |
| Combined MPG | 29 | 19 |
| Fuel Tank | 15.6 gal | 15.6 gal |
| Annual Fuel Cost (EPA) | $2,000/yr | No published data |
| Dimensions | ||
| Curb Weight | 4,008 lbs | 3,840 lbs |
| Wheelbase | 112.2" | 112.5" |
| Length | 185.9" | 189.1" |
| Width | 71.9" | 74.3" |
| Height | 56.7" | 56.6" |
| Safety | ||
| NHTSA Overall | 5/5 stars | 5/5 stars |
| Warranty | ||
| Bumper-to-Bumper | 4yr/50k | 4yr/50k |
| Powertrain | 4yr/50k | 4yr/50k |
| Corrosion | 12yr/unlimited | 12yr/unlimited |
| Roadside Assistance | 4yr/unlimited | 4yr/unlimited |
Data sources: licensed third-party automotive data, EPA fueleconomy.gov, NHTSA, and official manufacturer materials. Values marked est. are estimated.
2026 BMW 3 Series M340i xDrive vs M3 Questions Shoppers Ask
Use this page for the direct trim answer, then zoom back out to the BMW 3 Series lineup, the BMW brand hub, the Compact Cars, the how to pick a trim guide, or our mid-trim value research when you need the bigger shopping path behind this one matchup.
How much more does the 2026 3 Series M3 cost than the M340i xDrive?
The M3 starts at $79,300 compared to $64,300 for the M340i xDrive. That is a $15,000 difference, or approximately $264/month more on a 60-month loan.
Do the 2026 BMW 3 Series M340i xDrive and M3 have the same engine?
No. The M340i xDrive uses a 3.0L I6 mild-hybrid Turbo (386 hp, 398 lb-ft), while the M3 has the 3.0L I6 Turbo (473 hp, 406 lb-ft). That is 87 more horsepower. Both pair with the same 8-speed shiftable automatic.
Does the 2026 3 Series M340i xDrive come with RWD?
No. The M340i xDrive comes standard with AWD while the M3 has RWD. This affects traction, fuel economy, and curb weight.
Is the 2026 3 Series M340i xDrive or M3 safer?
Both share the same BMW 3 Series platform with an overall 5-star NHTSA safety rating. Safety ratings are model-level and identical across trims. The trim choice affects comfort and features, not crash protection.
What warranty does the 2026 BMW 3 Series come with?
All 2026 BMW 3 Series trims, including both the M340i xDrive and M3, come with BMW's standard warranty: 4yr/50k bumper-to-bumper and 4yr/50k powertrain coverage. Warranty does not vary by trim level.
Is the 2026 BMW 3 Series M3 worth $15,000 more than the M340i xDrive?
The M3 changes both the engine and drivetrain for $15,000 more. That is a hardware upgrade, not just a feature bump.
Which 2026 BMW 3 Series trim gets better fuel economy, the M340i xDrive or the M3?
The M340i xDrive is the more efficient of the two at 29 combined MPG, versus 19 for the other trim. That matters most if you are balancing running costs against the extra power, drivetrain, or comfort equipment tied to the pricier trim.
The Full Story Behind This Price Gap
Use the direct answer above for this exact matchup, then use these guides to understand whether you are really looking at a feature step-up, a package shuffle, or the point where the lineup starts changing in a meaningful way.
What $15,000 Gets You
The 3 Series M3 is a clear upgrade over the M340i xDrive. The $15,000 price increase gets you the 3.0L I6 Turbo engine (+87 hp) and RWD -- real functional changes, not just cosmetics.
M340i xDrive vs. M3: Day-to-Day
The M3 comes with the 3.0L I6 Turbo instead of the M340i xDrive's 3.0L I6 mild-hybrid Turbo. That means 87 more horsepower and 8 more lb-ft of torque. You will notice it most when merging, passing, or climbing at speed. In return, expect about 10 fewer combined MPG. The M3 drops to RWD from the M340i xDrive's AWD. Less traction capability, but potentially better fuel economy.
Fuel Economy Comparison
The 3 Series M340i xDrive gets 10 more combined MPG. At $3.50/gallon and 12,000 miles/year, that saves roughly $763 per year or $3,815 over five years of ownership.
Summary
The 3 Series M3 costs $15,000 more than the M340i xDrive (about $264/month more on a 60-month loan). That buys 6 meaningful changes at $2,500 per change. Whether that trade-off is worth it depends on which features matter to your daily driving.
Trim-Matched Accessories
These add-ons are split by trim intent so the recommendations follow the actual use case, not just the same repeated product block.
BMW 3 Series M340i xDrive
Value-trim add-onsThese picks fit the M340i xDrive best when the goal is covering the daily-use gaps without paying up to the next trim.
BMW 3 Series M3
Step-up trim add-onsThese picks suit the M3 when you want the accessories to match the nicer cabin, broader utility, or more premium use case.
As an Amazon Associate, TrimAtlas earns from qualifying purchases.
Specifications shown combine licensed third-party automotive data with official manufacturer, EPA, and NHTSA source material for the 2026 model year. Actual pricing, features, and availability may vary by region and dealer. Always confirm details with an authorized dealer before making a purchase decision. TrimAtlas is not affiliated with BMW or any dealership.
Page updated 2026-03-18. Verify equipment, pricing, and regional availability with the manufacturer or dealer.