What weaknesses does the BMW 8er G15 have?

The BMW 840i (Benziner, 333–340 PS) comes with 2 different engines: B58B30 (2018–2026, Be Careful) und B58B30 (2018–2026, Be Careful). Pay attention to the model year for the 840i!

The BMW M850i (Benziner, 530 PS) has the N63B44TU3 (4.4L V8 Biturbo) — rated: "Good Choice", 5 known weaknesses.

Vehicle Weaknesses

	Weakness	Cost
!	Soft-top seals: wind noise and moisture ingress The G14 convertible roof seals tend to develop leaks at the windscreen area after a few years. Water enters front left and right. Symptoms: Whistling wind noise from roof at high speed, damp seats or floor mats after rain from 50,000 km Ad convertible topgasket G14 8er Frontgasket Cabrio G14	Medium

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Known Problems and Issues

A total of 38 weaknesses have been documented for the BMW 8er G15 (2018–2026) — 22 engine-related and 16 vehicle-related. Typical issues affect Other, Electronics, Suspension, Body. Considered reliable: N63B44TU3 (4.4L V8 Biturbo).

8er (B57D30, 2018–2020) — Be Careful: EGR cooler failure, Timing chain elongation on early models, Turbocharger bearing damage at high mileage. Power: 320 PS.

8er (B58B30, 2018–2026) — Be Careful: Oil filter disintegrates — engine damage risk, Plastic oil filter housing cracks — coolant/oil mixing, PCV valve / valve cover membrane failed. Power: 333–340 PS.

What to watch out for with the BMW 8er? See the detailed listing of all engine and vehicle weaknesses in the sections above.

Frequently Asked Questions

What problems and weaknesses does the BMW 8er G15 have? +

The BMW 8er G15 has 22 known engine weaknesses and 16 vehicle weaknesses.

What should I look for when buying a used BMW 8er G15? +

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Which engine is recommended? +

Good choice: N63B44TU3 (4.4L V8 Biturbo). The most reliable engine is the N63B44TU3 (4.4L V8 Biturbo) with the lowest risk score. The most fun to drive is the N63B44TU3 (4.4L V8 Biturbo).

Which BMW 8er G15 engine is the most reliable? +

The {code} ({displacement}) is the most reliable engine in the BMW 8er G15. It has the lowest risk score of all available engines and is rated "Good Choice". However, there are 5 known weaknesses to be aware of.

Which BMW 8er G15 engine is the most fun? +

The {code} ({displacement}) offers the most driving fun in the BMW 8er G15 — rated: "Fun to Drive!". {description} 530 hp in the elegant 8 Series coupe — a pleasure on the motorway, V8 note in Sport rich and present. On tight corners the 2-tonne kerb weight and long wheelbase announce themselves. A grand tourer for distance, not for apexes.

Is the BMW 8er G15 worth buying used? +

The BMW 8er G15 is a good choice as a used car — 1 of 3 engine variants are rated 'Good Choice'.

What horsepower variants are available for the BMW 8er G15? +

The BMW 8er G15 is available with engine variants from 248 to 530 hp. Petrol: B58B30 (3.0L Turbo), N63B44TU3 (4.4L V8 Biturbo). Diesel: B57D30 (3.0L Diesel).

Last updated: February 2026 · All information without guarantee