BMW X5 F15 (2013–2018): A Quick Guide to Buying and Common Problems
Quick Summary
The BMW X5 F15 is a deep facelift of the E70, not an all-new generation. Thanks to aluminum and plastic, the car shed about 200 pounds, gained modern engines, and the 8-speed ZF 8HP automatic. The main risks are a bent crankshaft on the N57D30 diesel, oil burning on the N63 V8, and timing chain stretch on the N20B20A. With proper maintenance, the engine and transmission are good for more than 124,000 miles.
The Problem
Shopping for a used X5 F15 and unsure which engine to trust? The diesel is frugal but comes with crankshaft horror stories. The gas V8 is powerful yet “drinks oil.” The four-cylinder is the affordable entry, but its timing chain is a matter of when, not if. Without a grasp of each unit’s weak spots, buying turns into a lottery—and repair into an unplanned expense.
Symptoms
- A hum and vibration at specific rpm (N57D30 crankshaft)
- Oil consumption of up to 1 quart every 600 miles (1,000 km) (N63)
- A rattle at startup and cam timing fault codes (N20B20A)
- Knocking and vibration from the crankshaft pulley
- A sagging rear end after the car has been sitting (air suspension)
- Jolts between shifts in the automatic (worn ZF 8HP fluid)
Causes
The N57D30 is considered one of BMW’s best diesels, but the bent crankshaft risk exists. The defect isn’t widespread, yet it demands attention during diagnosis. Beyond that, the engine is reliable and frugal on the highway.
The N63 suffers from stuck piston rings, a result of high thermal loads and design features. In neglected cases, oil consumption reaches 1 quart every 600 miles (1,000 km), and repair often means replacing the pistons and rings.
The N55 balances power and reliability, but owners run into hydraulic lifter issues and leaky seals. Neither problem is critical, though both need timely attention.
The N20B20A is prone to timing chain stretch—one of its most common failures. A broken chain kills the engine, guaranteed.
The Fix
Which Engine to Choose
| Engine | Type | Main Risk | Mileage to Engine Rebuild |
|---|---|---|---|
| N57D30 | Diesel I6 | Bent crankshaft | 124,000+ miles |
| N63 | Gas V8 | Stuck rings, oil burning | 93,000–124,000 miles |
| N55 | Gas I6 | Hydraulic lifters, seals | 124,000+ miles |
| N20B20A | Gas I4 | Timing chain stretch | 93,000–124,000 miles |
Maintenance Schedule
- ZF 8HP automatic transmission fluid—every 37,000 miles. Officially, it’s a lifetime fill, but practice shows otherwise: without changes, the valve body and clutch packs wear out prematurely.
- Timing chain—every 124,000 miles, most relevant to the N20B20A. In practice, the chain can stretch sooner.
- Crankshaft damper pulley—every 62,000–93,000 miles. A worn pulley causes vibration and can damage the accessory drive.
- Rear air suspension—check for leaks. The air springs lose air over time, especially in cold weather.
- Radiators—check the fins for blockage regularly. Clogged radiators lead to overheating, which is deadly for any engine—the N63 especially.
Pre-Purchase Checklist
- [ ] Inspection on a lift: xDrive driveline, air suspension, underbody condition. The drive chain and the air springs must be dry.
- [ ] Computer diagnostics at a BMW specialist shop—that’s the only way to properly check the engine, transmission, and electronics.
- [ ] Body check for botched crash repairs: panel gaps, paint thickness, condition of the aluminum hood.
- [ ] Service history and a VIN decode—these will show the true mileage and the factory options.
- [ ] Decide on the options package: US-built cars offer the full list, Kaliningrad-built cars come in fixed trims.
Prevention
- Use quality fuel and oil—skimping turns into expensive injector and catalytic converter repairs.
- Buy parts from trusted suppliers: genuine or quality aftermarket from well-known brands.
- The diesels in this car are more reliable than the gas engines—if you’re not chasing performance, pick the N57D30.
- Don’t ignore vibrations and noises—early diagnosis of the pulley and chain costs less than a full rebuild.
The Bottom Line
The BMW X5 F15 is an excellent SUV if you buy with your head. The N57D30 diesel is the most balanced choice, but have the crankshaft checked. The gas N63 is powerful, but oil burning is a matter of time. The main rule: follow the schedule—automatic transmission fluid every 37,000 miles, timing chain every 124,000 miles, damper pulley every 62,000–93,000 miles. Start with a lift inspection and computer diagnostics—it will save you serious money.