BMW X4 trim comparison
2025 BMW X4 M40i vs Base
The X4 M40i starts at $66,700 while the Base is $79,100. That $12,400 gap buys 6 meaningful differences.
This trim jump changes the engine from 3.0L I6 mild-hybrid Turbo to 3.0L I6 Turbo. Everything else is secondary to whether that powertrain difference matters for how you drive.
If you would notice the 3.0L I6 Turbo every week, the Base makes sense. If not, the M40i is the cleaner stop because this jump matters for the powertrain first and the trim badge second.
Think about this as a monthly tradeoff, not just a sticker gap. The Base adds about $218/month on a typical 60-month loan, or around $13,080 more overall with interest. 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
The M40i and Base are mechanically identical where it counts: the same 8-speed shiftable automatic transmission and identical wheelbase and body dimensions.
The upgrade math
You are paying $12,400 for 5 measurable differences, which works out to about $2,480 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. 6 specification differences, 1 shared.
Full Specification Comparison
Specifications reflect available data as of early 2025. Confirm details with an authorized dealer before purchasing.
| Spec | M40i | Base |
|---|---|---|
| Pricing | ||
| MSRP | $66,700 | $79,100 |
| Powertrain | ||
| Engine | 3.0L I6 mild-hybrid Turbo | 3.0L I6 Turbo |
| Horsepower | 382 hp | 473 hp |
| Torque | 369 lb-ft | 457 lb-ft |
| Transmission | 8-speed shiftable automatic | 8-speed shiftable automatic |
| Drivetrain | AWD | AWD |
| Fuel Economy | ||
| City MPG | 22 | 15 |
| Highway MPG | 26 | 20 |
| Combined MPG | 23 | 17 |
| Fuel Tank | 17.2 gal | 17.2 gal |
| Dimensions | ||
| Curb Weight | 4,403 lbs | 4,597 lbs |
| Wheelbase | 112.8" | 112.8" |
| Length | 187.5" | 187.5" |
| Width | 76.3" | 75.9" |
| Height | 63.8" | 63.7" |
| 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.
2025 BMW X4 M40i vs Base Questions Shoppers Ask
Use this page for the direct trim answer, then zoom back out to the BMW X4 lineup, the BMW brand hub, the Compact SUVs, 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 2025 X4 Base cost than the M40i?
The Base starts at $79,100 compared to $66,700 for the M40i. That is a $12,400 difference, or approximately $218/month more on a 60-month loan.
Do the 2025 BMW X4 M40i and Base have the same engine?
No. The M40i uses a 3.0L I6 mild-hybrid Turbo (382 hp, 369 lb-ft), while the Base has the 3.0L I6 Turbo (473 hp, 457 lb-ft). That is 91 more horsepower. Both pair with the same 8-speed shiftable automatic.
Do the 2025 X4 M40i and Base have the same drivetrain?
Yes. Both come with AWD as standard. The differences between these trims are in features and equipment, not drivetrain.
What warranty does the 2025 BMW X4 come with?
All 2025 BMW X4 trims, including both the M40i and Base, 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 2025 BMW X4 Base worth $12,400 more than the M40i?
The $12,400 buys the 3.0L I6 Turbo. If that powertrain matters for how you drive, yes. If not, the M40i does the same job for less.
Which 2025 BMW X4 trim gets better fuel economy, the M40i or the Base?
The M40i is the more efficient of the two at 23 combined MPG, versus 17 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.
Breaking Down the $12,400 Gap
The Base earns its premium. For $12,400 more, you get the 3.0L I6 Turbo engine (+91 hp), making this one of the more straightforward upgrade decisions in the X4 lineup.
How the M40i and Base Feel Different
Moving from the M40i to the Base means a different engine entirely. That means 91 more horsepower and 88 more lb-ft of torque. You will notice it most when merging, passing, or climbing at speed. In return, expect about 6 fewer combined MPG.
Fuel Economy Comparison
The X4 M40i gets 6 more combined MPG. At $3.50/gallon and 12,000 miles/year, that saves roughly $645 per year or $3,225 over five years of ownership.
The Short Version
The X4 Base costs $12,400 more than the M40i (about $218/month more on a 60-month loan). That buys 5 meaningful changes at $2,480 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 X4 M40i
Value-trim add-onsThese picks fit the M40i best when the goal is covering the daily-use gaps without paying up to the next trim.
BMW X4 Base
Step-up trim add-onsThese picks suit the Base 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 2025 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.