– BMW B46, B48 and B58 engines contain oil filter housings that leak coolant and force owners to spend thousands of dollars on repairs and replacements.
That view is shared by three customers who have filed a lawsuit against the BMW oil filter housing affecting these vehicles equipped with B46, B48 or B58 engines.
BMW 1 Series 2014-2021
BMW 2 Series 2014-2021
BMW 3 Series 2014-2021
BMW 4 Series 2014-2021
BMW 5 Series 2014-2021
BMW X1, X2, X3, X4 from 2014-2021
MINI Cooper 2014-2021
MINI Cooper Clubman from 2014-2021
MINI Cooper Countryman from 2014-2021
The BMW class action says the oil filter housing must last at least 150,000 miles. But owners complain about having to pay up to $4,000 to replace the oil filter housing after 60,000 miles. BMW customers say a typical oil filter housing replacement always costs $1,500 to $3,500, depending on the vehicle.
The BMW lawsuit says the engine oil filter housings of the B46, B48 and B58 contained cartridge oil filter components and the oil coolers. This oil filter housing is attached to the side of the engine block with bolt fasteners.
But the class action claims that the B46, B48 and B58 engines experience premature oil filter housing and gasket failure because the “polycarbonate housing and seal gaskets become brittle due to repeated heating and cooling cycles.”
“More specifically, the internal wall assemblies of the oil filter housing that separate and/or warp the oil and coolant passages and/or gaskets that seal the various oil and water passages fail. This occurrence causes the loss of engine coolant to either leak into the oil pan or spill out, which can result in overheating and/or engine failure.” — BMW oil filter housing class action lawsuit
The plaintiffs allege that BMW phased out cast aluminum engine oil filter housings and switched to “inferior polycarbonate housings” around 2011. But since 2015, the automaker has reportedly covered up all issues related to the polycarbonate oil filter housings in B46, B48 and B58 engines.
Illinois prosecutor Aaron Eiger says he purchased a used MINI Countryman S in December 2020, but the engine oil filter housing leaked coolant in July 2025 when the MINI had about 60,000 miles on the odometer. The oil filter housing replacement cost almost $1,700.
North Carolina plaintiff Kendra Cherry purchased a used 2019 BMW The BMW engine had 79,312 miles on the odometer.
California prosecutor Kelly Haley Fucillo purchased a used 2018 BMW 430i in August 2025, but in January 2026 the leaking engine oil filter housing needed to be replaced. The BMW engine had 68,342 miles on it and the oil filter housing cost the plaintiff approximately $4,000.
The lawsuit refers to actions by BMW due to coolant leakage from the oil filter housings.
BMW SIB 11 10 25 was issued to dealers because the oil filter housing seal could put too much pressure on the bushing/insert in the oil filter housing. The pressure can cause the insert to deform, causing an external coolant leak.
(The photo above shows the crack in the oil filter housing coolant canister/insert.)
The class action also alleges that coolant leaks in the oil filter housing decrease the value of a BMW vehicle.
The BMW oil filter housing coolant leak lawsuit was filed in the United States District Court for the District of New Jersey: Eiger, et al., v. BMW of North America, LLC.
The plaintiffs are represented by Kantrowitz, Goldhamer & Graifman, PC
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