2019 to 2025SUV CoupeM Performance
Photo: HJUdall, public domain, via Wikimedia Commons
The G02 is the second X4 M40i: an X3 M40i under a sloping coupe roof, built in South Carolina and sold here from 2019 to 2025, when the X4 ended.
Each part is scored from 0 to 100 on a fixed outside scale. Acclaim comes from published expert lists, launch reviews and awards; the more acclaimed a car, the less its ownership cost counts in this all-time score (its dollars below are unchanged). A part marked not measured carries no weight for this car, and the others share its weight. This car is held one point below its M twin, the F98 X4 M, by the site's twin rule.
5 prices from sources that allow this use (driveway.com), read October 27, 2026: the middle one is $38,600, about 62% of the price new (51% once the price new is put in today's dollars). Asking prices sit above what cars sell for.
Long-term value starts to count in the score once 75% of the 69 generations have permitted prices. Today 43 do.
About $2,481 a year to own ($1,587 to $3,701), about $11,495 over five years, bought at five years old or its own age if older, kept five years.
Expect about $1,600 to $3,700 a year; the bills that decide it are oil pump failure, oil filter housing and valve cover gasket leaks and coolant loss. Ownership risk: moderate.
Guide Score method v5-final.14, an editorial score built only from permitted, sourced data. How it works.
Colors it came in, most wanted first. Pick one to see the page in it.
2021The best year to buy, reading 63 of 100, about $2,355 a year to own.
From our log of the changes between model years, each with its source. Only changes the score reads count as reasons; recalls BMW fixes for free, options and tuning notes do not. The cost a year is for a car bought at five years old, or its own age if older, kept five years. How the score works.
It has the B58 3.0-liter turbo six, an eight-speed automatic and all-wheel drive, with 355 hp for 2019, 382 hp from 2020, and a 48-volt mild-hybrid system from the 2022 facelift.
New, it cost about $4,600 more than an X3 M40i (2022 prices), but used prices sit close to the X3's; the roof costs about an inch of rear headroom, and cargo space behind the rear seats drops from 28.7 to 18.5 cubic feet.
The engine oil pump on 2020 and 2021 cars is the expensive known fault; also check the oil filter housing for leaks and, on 2019 cars, whether the crankcase valve is covered by BMW's 15-year warranty. A car up to five years old with under 60,000 miles can be sold as BMW Certified.
What goes wrong on this generation, roughly what a fix costs at an independent shop, and how to spot it before you buy. Every X4 M40i generation compared.
Run the oil level check in iDrive. On 2020 and 2021 cars a check that stalls at 15 to 30 percent is usually a software fault BMW fixes with an update (SIB 11 04 26), so ask whether the update was done and, if the check still will not finish, have a BMW dealer or specialist check the oil pressure. Ask for an invoice if the pump has been replaced, and treat low oil pressure warnings in the history as a reason to walk away.
Look for oil or coolant residue at the oil filter housing and the valve cover, and ask about coolant top-ups.
NHTSA files some of this car’s recalls and owner complaints under the X4, so they are missing here. Check recalls by VIN, and read complaints by year, make and model, at nhtsa.gov/recalls.
Certain 2020 and 2021 X4 M40is were recalled (NHTSA 21V598000) because the engine software could cut brake assist while the engine starts. The brakes still work but need a much harder push. Dealers update the software free of charge.
On a 2020 or 2021 car, run the VIN through NHTSA or a BMW dealer and ask for proof the update was done.
The B58's coolant expansion tank can crack at its seams, and hoses and fittings around the engine can seep, so the loss is often slow: a low-coolant warning now and then. RepairPal puts a new tank on the sister X3 at about $460 to $520.
Ask about low-coolant warnings and top-ups, and look for dried coolant around the expansion tank and hoses with the engine cold.
The plastic oil filter housing and its gaskets can leak oil or coolant, often from about 60,000 miles, and the valve cover gasket can weep. A proposed class action filed in January 2026 covers 2014 to 2021 X3s and X4s among other BMWs with this engine family (2019 to 2021 X4s are in the proposed class); BMW has moved to dismiss it, and no class has been certified. Both jobs take many hours of labor.
Look for oil or coolant residue at the oil filter housing and the valve cover, and ask about coolant top-ups.
The crankcase ventilation (PCV) valve's diaphragm can split, bringing blue-white smoke after a cold start, a whistle at idle and cylinder 6 misfire codes. BMW covers the valve for 15 years or 150,000 miles on X4 M40is built January 2018 to July 2019 (SI B01 14 23).
Ask whether the valve was replaced under SI B01 14 23; within 15 years and 150,000 miles a BMW dealer fixes it free.
The B58's variable oil pump has a plastic ring inside that can crack, and oil pressure then becomes erratic or is lost, which can ruin the engine. BMW specialist BRR Performance says it affects the updated engine (B58TU) built from 2018 to 2022, most often after extreme cold or with oil thicker than the specified 0W-20, that BMW moved to a metal ring in 2022 engines, so an early 2022 car can have the plastic part, and that the first version of the engine, which BMW lists for the 2019 X4 M40i, does not seem to fail this way. The X4 shares the X3 M40i's engine, whose federal complaints cluster on 2020 and 2021 cars; one 2021 X4 owner reported the failure at 65,000 miles. RepairPal puts the job on the sister X3 at about $2,100 to $2,800 at an independent shop.
Run the oil level check in iDrive. On 2020 and 2021 cars a check that stalls at 15 to 30 percent is usually a software fault BMW fixes with an update (SIB 11 04 26), so ask whether the update was done and, if the check still will not finish, have a BMW dealer or specialist check the oil pressure. Ask for an invoice if the pump has been replaced, and treat low oil pressure warnings in the history as a reason to walk away.
None returned by NHTSA under this car’s own name for the 2019 to 2025 model years.
NHTSA files some of this car’s recalls under the X4, so they are missing here. Check yours by VIN at nhtsa.gov/recalls.
Live from NHTSA, across the 2019 to 2025 model years.
Our estimates at an independent shop, parts and labor; fuel from the EPA.
Pricing tires for this car? Compare the factory sizes at Discount Tire, and ask a local shop to match it.
Fuel from EPA fueleconomy.gov: its yearly cost is for 15,000 miles with 55% city driving, moved here to the miles a year the two-year budget uses. The rest are our estimates at independent-shop and retail prices from September 2026. Service is a year of routine maintenance at 10,000 miles: one or two oil changes, brake fluid, filters, and spark plugs spread over their interval. Repairs are separate. Tires are a mounted set of summer tires; brakes are pads and rotors on both axles. Prices vary by region and shop.
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The cars this one gets weighed against, by lineage and by price.
The first X4 M40i, with the N55 six at 355 hp.
The second X4 M40i: the B58 six at 355 hp, then 382 hp from 2020, and a 48-volt mild hybrid from 2022. The X4 ended with the 2025 model year.
The M Index, once a month: any change to the X4 M40i's guide or score, with the reason, new recalls on M cars, and one thing to check before you buy.