Original BMW Crankcase Vent Hose for BMW 325, 325e, 325es, and 528e (1982–1987)

The Original BMW crankcase vent hose, part number 11-15-1-278-804, is the breather line for the M20 six-cylinder in the 1982–1987 BMW 528e, the 1984–1986 BMW 325e, and the 1986 BMW 325 and 325es. BMW calls it a vent hose and supplies it as a single piece weighing 78 grams. Each car uses one. BMW began producing this number in September 1981, so it was in place from the start of E28 528e production through the end of the E30 325e run. A crankcase vent hose carries blow-by gases out of the crankcase so the engine can draw them back into the intake and burn them, rather than letting pressure build inside the block.

Original BMW Parts carry a 24-month parts warranty.

This hose replaced an earlier BMW number, 11-15-1-276-903. BMW marks the change as exchangeable retrospectively, which means the current hose is the correct replacement on cars that left the factory with the earlier part. The cross-reference numbers 6036 and W01331639009 also point to this same hose, which is useful if you are matching it against an older parts invoice or a box you pulled off the shelf. The same vent hose is shared between the E28 and E30 versions of the M20 engine, so a 528e and a 325e take the identical part.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-15-1-278-804
• BMW part name: vent hose (crankcase breather hose)
• Quantity per car: one
• Weight: 78 g (0.2 lb)
• Production start: September 1981
• Replaces earlier number 11-15-1-276-903, exchangeable retrospectively
• Cross-reference numbers: 6036 and W01331639009
• Sold individually as one hose
• Warranty: 24 months on Original BMW Parts

Common Questions

Will this replace hose 11-15-1-276-903?
Yes. BMW superseded 11-15-1-276-903 with this number and rates the change as exchangeable retrospectively, so it is the correct hose for cars that came with the earlier part.

How many of these does my car use?
One. BMW fits a single vent hose per car, and it is sold as one piece.

Is the 528e hose the same as the 325e hose?
Yes. BMW uses this one number on the M20 engine in both the E28 528e and the E30 325e, 325, and 325es.

Call PMB with your chassis number and we will confirm the hose before it ships.

Fitment & Compatibility

Use the fitment table below to confirm year, model, submodel, and application notes before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.