When you're looking at a used 2013 BMW X5 50i (E70 generation), engine confusion is common. Rumors swirl regarding whether this specific V8 luxury SUV features the updated N63TU power plant or an older configuration. Let's clear the air immediately: the 2013 BMW X5 50i actually does feature the N63TU (Technical Update) engine, arriving just as BMW transitioned its twin-turbo V8 lineup to solve earlier reliability gremlins.
Many buyers mix up model years and body codes, assuming the E70 generation wrapped up with older naturally aspirated units or carried over the troublesome pre-update N63 without changes. In reality, the 2013 model year marked a critical midpoint where BMW rolled out significant internal revisions to address oil consumption, valve stem seals, and timing chain stretch. If you're shopping for one or trying to understand your own garage project, knowing exactly what's under the hood matters for long-term ownership.
Understanding the E70 BMW X5 50i Engine Lineup
BMW's naming convention can trick even seasoned enthusiasts. The "50i" badge indicates a 4.4-liter displacement utilizing forced induction. For the E70 generation spanning from 2011 to 2013, the xDrive50i replaced the older 4.8i naturally aspirated V8 models, introducing twin turbochargers mounted in the engine's "hot V" valley.
The original N63 debuted in 2008 and gained a notorious reputation for eating oil, frying fuel injectors, and failing batteries due to excessive heat soak. By late 2012 and into the 2013 model year, BMW introduced the N63TU update. This revision brought forged connecting rods, heavier-duty pistons, revised piston rings, Valvetronic variable valve lift, and updated high-pressure fuel injectors.
Key Technical Specifications of the 2013 N63TU
- Displacement: 4.395 liters (4.4L) V8
- Induction: Twin parallel turbochargers (hot V configuration)
- Horsepower: 400 horsepower at 5,500 - 6,400 rpm
- Torque: 450 lb-ft at 1,750 - 4,500 rpm
- Valvetrain: Double-VANOS with upgraded Valvetronic III
That massive torque peak starting at just 1,750 rpm gives the 2013 X5 50i its effortless pull off the line. You don't have to rev it out to get moving, which makes heavy highway passing smooth and immediate.
Debunking the Turbo V8 Myths
Let's address the most persistent myths surrounding the 2013 X5 50i engine bay. Internet forums often repeat bad information, leading buyers to run away from good cars or buy lemons thinking they got a bulletproof design.
Myth 1: "The 2013 X5 50i has a naturally aspirated V8"
Some older articles and misinformed sellers claim the 50i badge still denotes a naturally aspirated motor like the older N62. That's entirely false. Every E70 X5 50i is twin-turbocharged. If you lift the plastic engine cover, you'll immediately see the twin turbochargers nestled neatly between the cylinder heads alongside the coolant expansion tanks for the intercoolers.
Myth 2: "The 2013 model has the exact same engine as the 2011 model"
While both cars wear an N63 badge on paper, BMW quietly instituted the Technical Update (TU) package during production changes for the 2013 model year. Cars built from mid-2012 onward received updated ECU software, revised crankcase ventilation hoses, and improved valve stem materials that drastically cut down on common oil-burning issues. You can verify this by checking the RealOEM parts catalog with your specific production date VIN.
Myth 3: "All N63 engines blow up by 60,000 miles"
While early non-TU N63 engines suffered from severe design flaws, the N63TU featured reinforced components that standard mechanics often overlook. When maintained with proper 5,000-mile oil changes instead of BMW's old 15,000-mile interval, these power plants routinely cross 150,000 miles without catastrophic failure.
Common Maintenance Realities to Watch For
Even though the 2013 model features the updated engine, you're still dealing with a high-performance German V8 packed into a tight engine bay. Heat management remains the primary challenge.
- Coolant Lines and Plastic Fittings: Over time, plastic cooling flanges and turbo coolant return lines become brittle. Ignoring a small coolant leak can cause rapid overheating and warped cylinder heads.
- Dual Battery System: The E70 X5 relies on a main trunk battery and an auxiliary battery to power electronics during start-stop and standby. Weak batteries trigger random electrical faults and transmission codes.
- Injector Sealing: While the Piezo injectors in the N63TU are more reliable than early N63 units, carbon buildup can still foul tips if the car only sees short city trips.
If you want to dive deeper into official recall history and technical service bulletins for this platform, check the NHTSA database for verified owner complaints and manufacturer campaigns.
What It's Like to Drive the 2013 X5 50i
Out on the road, the N63TU transforms the heavy E70 chassis into a deceptively fast machine. Steering is hydraulic (on models without active steering), providing heavy, communicative feedback that newer electronic steering racks lack.
When you mash the throttle, power hits instantly without noticeable turbo lag. The eight-speed ZF automatic transmission shifts seamlessly, keeping the engine in its fat torque band. Fuel economy won't impress anyone—expect around 14 mpg in city driving and perhaps 19 mpg on the highway if you keep your foot light—but the exhaust note and effortless passing power make up for the trips to the gas station.
Frequently Asked Questions
How can I tell if my 2013 X5 50i has the N63TU engine?
The easiest way is to check your vehicle's production date on the driver's door jamb sticker. Cars built from July 2012 onward feature the N63TU. You can also run your VIN through an online BMW decoder like BimBeemer to view the exact factory engine code and build sheet.
Is the 2013 X5 50i more reliable than the 2011 model?
Yes. The 2013 model benefits from the N63 Technical Update, which resolved several major factory defects present in the 2011 and 2012 production runs, particularly regarding oil consumption and injector longevity.
How often should I change the oil in an N63TU?
Don't follow the factory 15,000-mile interval. Change your engine oil every 5,000 to 7,500 miles using high-quality LL-01 or LL-04 approved synthetic oil to protect the turbo bearings and timing chain components from premature wear.
Does the 2013 X5 50i require premium fuel?
Yes. Running lower octane fuel triggers knock sensors, retards ignition timing, and robs the twin-turbo V8 of its peak performance while increasing carbon buildup inside the cylinders. Always fill up with 91 or 93 octane gas.
