BMW Z4 trim comparison
2026 BMW Z4 sDrive30i vs M40i
The Z4 sDrive30i starts at $56,100 while the M40i is $68,400. That $12,300 gap buys 7 meaningful differences.
This trim jump changes the engine from 2.0L I4 Turbo to 3.0L I6 Turbo. Everything else is secondary to whether that powertrain difference matters for how you drive.
Start with the sDrive30i if the 2.0L I4 Turbo already feels sufficient for the way you drive. Step up to the M40i only when the 3.0L I6 Turbo powertrain is the reason you are moving higher in the lineup.
Think about this as a monthly tradeoff, not just a sticker gap. The M40i adds about $216/month on a typical 60-month loan, or around $12,960 more overall with interest. The payment only makes sense if that different powertrain matters to the way you actually drive, tow, or live with the vehicle.
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
Both the sDrive30i and M40i share the same 8-speed shiftable automatic transmission and identical wheelbase and body dimensions.
The upgrade math
You are paying $12,300 for 6 measurable differences, which works out to about $2,050 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, 1 shared.
Full Specification Comparison
Specifications reflect available data as of early 2026. Confirm details with an authorized dealer before purchasing.
| Spec | sDrive30i | M40i |
|---|---|---|
| Pricing | ||
| MSRP | $56,100 | $68,400 |
| Powertrain | ||
| Engine | 2.0L I4 Turbo | 3.0L I6 Turbo |
| Horsepower | 255 hp | 382 hp |
| Torque | 295 lb-ft | 369 lb-ft |
| Transmission | 8-speed shiftable automatic | 8-speed shiftable automatic |
| Drivetrain | RWD | RWD |
| Fuel Economy | ||
| City MPG | 25 | 23 |
| Highway MPG | 33 | 29 |
| Combined MPG | 28 | 25 |
| Fuel Tank | 13.7 gal | 13.7 gal |
| Annual Fuel Cost (EPA) | $2,050/yr | $2,300/yr |
| Dimensions | ||
| Curb Weight | 3,314 lbs | 3,543 lbs |
| Wheelbase | 97.2" | 97.2" |
| Length | 170.7" | 170.7" |
| Width | 73.4" | 73.4" |
| Height | 51.4" | 51.3" |
| 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 Z4 sDrive30i vs M40i Questions Shoppers Ask
Use this page for the direct trim answer, then zoom back out to the BMW Z4 lineup, the BMW brand hub, the Sports 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 Z4 M40i cost than the sDrive30i?
The M40i starts at $68,400 compared to $56,100 for the sDrive30i. That is a $12,300 difference, or approximately $216/month more on a 60-month loan.
Do the 2026 BMW Z4 sDrive30i and M40i have the same engine?
No. The sDrive30i uses a 2.0L I4 Turbo (255 hp, 295 lb-ft), while the M40i has the 3.0L I6 Turbo (382 hp, 369 lb-ft). That is 127 more horsepower. Both pair with the same 8-speed shiftable automatic.
Do the 2026 Z4 sDrive30i and M40i have the same drivetrain?
Yes. Both come with RWD as standard. The differences between these trims are in features and equipment, not drivetrain.
What warranty does the 2026 BMW Z4 come with?
All 2026 BMW Z4 trims, including both the sDrive30i and M40i, 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 Z4 M40i worth $12,300 more than the sDrive30i?
The $12,300 buys the 3.0L I6 Turbo. If that powertrain matters for how you drive, yes. If not, the sDrive30i does the same job for less.
Which 2026 BMW Z4 trim gets better fuel economy, the sDrive30i or the M40i?
The sDrive30i is the more efficient of the two at 28 combined MPG, versus 25 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 $12,300 Gap
The M40i earns its premium. For $12,300 more, you get the 3.0L I6 Turbo engine (+127 hp), making this one of the more straightforward upgrade decisions in the Z4 lineup.
How the sDrive30i and M40i Feel Different
The M40i gets the 3.0L I6 Turbo, which changes the character of the car. That means 127 more horsepower and 74 more lb-ft of torque. A significant jump that changes the driving experience. The cost of that extra capability is roughly 3 fewer combined MPG.
Fuel Economy Comparison
The Z4 sDrive30i gets 3 more combined MPG. At $3.50/gallon and 12,000 miles/year, that saves roughly $180 per year or $900 over five years of ownership.
The Short Version
$12,300 more for the Z4 M40i gets you 6 real differences. At $216/month more, the question is whether those specific changes are things you will use regularly.
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 Z4 sDrive30i
Value-trim add-onsThese picks fit the sDrive30i best when the goal is covering the daily-use gaps without paying up to the next trim.
BMW Z4 M40i
Step-up trim add-onsThese picks suit the M40i when you want the accessories to match the nicer cabin, broader utility, or more premium use case.
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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.