Intake Manifold Gasket (Double) - 325e/i (9/87-91), 525i (89-90), 528e (12/86-) - This gasket seals the critical mating surface between the intake manifold and the cylinder head.
- The Function: Its sole purpose is to maintain a perfect, airtight seal for the engine's air induction tract.
- Signs of Failure: Over time, heat cycles degrade this gasket, causing it to crack or warp. This results in unmetered air entering the cylinders (a vacuum leak), leading to a rough idle, engine misfires, lean running codes, and poor fuel economy.
- Design Note: On the 6-cylinder engine family it serves, this specific part number is a dual-port configuration, meaning a single gasket spans and seals two adjacent intake runners.
This gasket is designed exclusively for vehicles running the classic BMW M20 straight-six engine built between 1987 and 1993.
- BMW 3 Series (E30 Chassis):
- 325i / 325is / 325ic: 1987–1993 (2.5L engine)
- 325iX: 1988–1991 (All-wheel-drive 2.5L variant)
- 325e / 325es: 1984–1988 (Efficiency-focused 2.7L "Eta" engine)
- BMW 5 Series (E28 Chassis):
- 528e: 12/86 - 1988 (2.7L "Eta" engine)
- BMW 5 Series (E34 Chassis):
- 525i: 1989–1990 (Specifically early E34 models featuring the single-overhead-cam M20 engine before BMW switched to the twin-cam M50 motor).
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