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BMW M20 engine: specs and known issues

The BMW M20 is a naturally aspirated inline-six petrol engine with a 2.0-, 2.3-, 2.5- and 2.7-liter displacement, produced 1977–1993, per Wikipedia. We do not have repair prices for it yet.

Specs and history from Wikipedia (revisions listed below)

M20 at a glance

Production	1977–1993	[1]
Configuration	Straight-6	[1]
Displacement	1991 cc (121.5 cu in) / 2316 cc (141.3 cu in) / 2494 cc (152.2 cu in) / 2693 cc (164.3 cu in)	[1]
Fuel type	Petrol	[1]
Valvetrain	SOHC	[1]
Block	Cast iron	[1]
Cylinder head	Cast aluminum alloy	[1]
Fuel system	Carburetor / Fuel injection	[2]

Cars with the M20

Cars and chassis codes named in Wikipedia's article on this engine. It can include related or successor models, so treat it as a lead and check your exact car. Open a linked model to see its repair costs.

Model pages for the M20

Chassis pages whose cars, per Wikipedia, used this engine.

E21 3 Series E30 3 Series E12 5 Series E28 5 Series E34 5 Series

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Before and after

Predecessor: None
Successor: BMW M50

Related engines

BMW M30 (1968–1995)
BMW M88/S38 (1978–1989)
BMW M102 (1980–1982)
BMW M106 (1982–1986)
BMW M21 (1983–1991)

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Common questions

When was the BMW M20 engine produced?

1977–1993, per Wikipedia.

Sources

Wikipedia: BMW M20 (revision 1374095419, read 2026-10-23)
Wikipedia: List of BMW engines