BMW F32 (4 Series): Buyer’s Guide and Common Problems
Quick take. The BMW F32 is a rear-wheel-drive 4 Series coupe built from 2013 to 2020. The biggest purchase risk is the early four-cylinder N13 and N20 engines (2013–2015), whose timing chains stretch by 50,000–62,000 miles. The safe bets are the B48 among four-cylinders and the B58 among inline-sixes. The N47, B47, and N57 diesels run from frugal to seriously torquey. This guide is for anyone shopping for a used F32 who wants to avoid expensive surprises.
The Problem
You’re shopping for a BMW 4 Series coupe and spot an early F32 at an attractive price. But that apparent bargain often hides an engine that needs serious money by 50,000–62,000 miles. Without knowing each engine’s weak spots, it’s easy to end up with a car whose timing chain is already at its limit and which burns oil by the quart. Here’s which engines are worth their price—and which only make sense with a documented repair history.
Symptoms of Problem Engines
- Rattle or metallic knock from the timing chain on a cold start
- Blue smoke under acceleration
- Excessive oil consumption
- Coolant seepage at the rear of the engine block
- Power loss and rough running
- Jerks and delays during automatic transmission shifts
- Oil seepage under the valve cover and around the oil filter
Causes
The early four-cylinder N13 and N20 engines (2013–2015) are the main source of trouble. The timing chain stretches by as early as 50,000–62,000 miles, risking a snap and a full engine rebuild. Worn piston rings and valve stem seals drive up oil consumption, and coolant leaks appear at the rear of the engine block.
The N55 is an inline-six with direct injection, which lets carbon build up on the intake valves. That saps power and hurts fuel economy. Oil leaks around the valve cover, oil filter, and oil pan are also common.
The B48 is the evolution of the N20, cured of many of its teething troubles—but coolant leaks are still possible.
The Solution
Which Engine to Choose
| Engine | Type | Notes |
|---|---|---|
| N13 | 1.6L turbo, 4-cyl | Timing chain by 50,000–62,000 miles; oil consumption |
| N20 | 2.0L turbo, 4-cyl | Timing chain by 50,000–62,000 miles; oil consumption |
| B38 | 1.5L, 3-cyl | A rare, fuel-efficient option |
| B48 | 2.0L, 4-cyl | More reliable than the N20; rare coolant leaks |
| N55 | 3.0L inline-six | Carbon on the valves; oil leaks |
| B58 | 3.0L inline-six | The “German 2JZ”; tunes to 400+ hp |
| N47 | Diesel, 4-cyl | Post-2013: no chain issues; needs quality oil |
| B47 | Diesel, 4-cyl | Modern and reliable |
| N57 | Diesel, inline-six | Maximum torque |
Pre-Purchase Inspection
- Check the service history. Oil should be changed every 6,000 miles on gas engines and every 9,000 miles on diesels. Missing records are a reason to think twice.
- Listen to the timing chain cold. Start the engine after it has sat overnight. Any odd noise is a red flag, especially on the N13 and N20 (2013–2015).
- Inspect the engine for leaks. Check the rear of the engine block for coolant seepage, and the valve cover and oil filter for oil leaks.
- Watch the exhaust color under acceleration. Blue smoke means worn valve stem seals or piston rings.
- Test-drive it. Jerks and delayed shifts point to an automatic transmission fluid change that’s overdue.
Maintenance
- Engine oil: every 6,000 miles on gas engines, 9,000 miles on diesels. BMW-approved oils only.
- Automatic transmission fluid: the 8-speed ZF is billed as “sealed for life,” but that’s a myth. Change it every 62,000 miles—it extends the life of the valve body and solenoids.
- Coolant: check the level regularly, especially on the N13, N20, and B48.
- N55 valve cleaning: mechanically decarbonize the valves every 37,000–50,000 miles.
Tuning
The B58 readily clears 400+ hp on a tune alone—no turbo or intercooler swap needed. Tuning an N13/N20 without a prior engine rebuild is a gamble—extra power accelerates wear on the timing chain and pistons. Sport suspension and upgraded brakes sharpen the handling, but the stock rotors can overheat on track.
Prevention and Checklist
- Change the oil strictly on schedule—skimping there accelerates wear on turbo engines
- Listen to the timing chain cold at every purchase
- Keep an eye on the coolant level on the N13, N20, and B48
- Change the automatic transmission fluid every 62,000 miles
- On the N55, plan on valve cleaning every 37,000–50,000 miles
- Before tuning an N13/N20, replace the timing chain and oil pump first
Bottom Line
The BMW F32 is a great coupe, but the engine choice decides everything. Avoid early N13 and N20 engines without a documented chain replacement, and go for the B48 or B58. The post-2013 N47, B47, and N57 diesels are reliable picks on quality oil. Before you buy, always listen to the chain cold and dig through the service history. Pick the right engine and the F32 will reward you instead of bleeding you dry.