BMW M43TU Engine (M43TUB19)

  1. Specifications
  2. Overview, problems
  3. Performance tuning

M43TU Specs

Manufacturer Steyr Plant
Also called BMW M43TU
Production 1998-2002
Cylinder block alloy Cast iron
Configuration Straight-4
Valvetrain SOHC
2 valves per cylinder
Piston stroke, mm (inch) 83.5 (3.29)
Cylinder bore, mm (inch) 85 (3.35)
Compression ratio 9.7
Displacement 1895 cc (115.6 cu in)
Power output 77 kW (105 HP) at 5,300 rpm
87 kW (118 HP) at 5,500 rpm
Torque output 165 Nm (122 lb·ft) at 2,500 rpm
180 Nm (133 lb·ft) at 3,900 rpm
Redline 6,200 rpm
HP per liter 55.4
Fuel type Gasoline
Fuel system Bosch BMS46
Weight, kg (lbs) ~138 (305)
Fuel consumption, L/100 km (mpg)

for E46 318Ci
11.0 (21.4)
6.0 (39.2)

8.0 (29.4)
Turbocharger Naturally aspirated
Oil consumption, L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 750 miles)
Recommended engine oil 0W-30
Engine oil capacity, L (qt.) 4.0 (4.2)
Oil change interval, km (miles) 7,000-10,000
Normal engine operating temperature, °C (F) 90-95 (195-203)
Engine lifespan, km (miles)
-Official information

300+ (185)
Tuning, HP
-Max HP
-No life span loss


The engine is installed in BMW 316i E36
BMW 316i E46
BMW 318Ci E46

BMW M43TU engine reliability, problems and repair

M43TU was firstly introduced in 1998. It turned out to be modified version of M43B18. New engine has improved cylinder block for balancing shafts. At the same time cylinders dimensions were increased up to 85 mm. New crankshaft was installed with 83.5 mm stroke. Pistons and connecting rods were also modified.
None changes have been made in cylinder head with the exception of lower power and new camshaft. DISA intake manifold was made of plastic.
Engine was equipped by Bosch BMS 46 control system.
This engine was mainly used in BMW 16i and 18i models.
Along with this motor production of 16V M44B19 was launched.
In 2001 M43TU motor was replaced by new 2-liter N42B20 engine.

BMW M43TU engine modifications and differences

1. M43TU B19 OL (1998 – 2002) is a base modification with 118 HP at 5,500 rpm, 180 Nm of torque at 3,900 rpm
2. M43TU B19 UL (1998 – 2001) is a new version with lower power, another camshaft. It produces 105 HP at 5,300 rpm, 165 Nm of torque at 2,500 rpm.

BMW M43TU disadvantages and problems

All common problems and malfunctions of M43B19/M43TU are absolutely the same as in M43B18 engine. HERE you can find out about all of them.

BMW M43TU engine tuning

M43B19 Stroker. Turbo

M43TU engine is absolutely equal to its previous M43B18 version. That is why its tuning is also the same as for M43. You can get acquainted with procedure HERE.


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