Which BMW M340i generation is the most reliable?

In our guide, the M340i G20 facelift (2023 to 2026): its reliability score runs 89 to 92 of 100 across its model years. The lowest is the M340i G20, at 84 to 89.

What goes wrong on a BMW M340i?

M340i G20 facelift: oil filter housing and valve cover gasket leaks (about $1,500), high pressure fuel pump (about $1,100). M340i G20: oil pump failure (about $2,600), oil filter housing and valve cover gasket leaks (about $1,500).

Which BMW M340i years should I avoid?

No M340i model year in our guide is held back by a specific problem; the gaps between years come from age.

What is the best BMW M340i year to buy?

By our Guide Score, which weighs desirability, driving and reliability, the 2022 M340i G20, at 71 of 100. Best year of each generation: M340i G20 facelift 2026 (69), M340i G20 2022 (71).

Problems by generation

BMW M340i problems by generation

The known problems on all 2 M340i generations in our guide (G20 and G20 facelift): what a fix costs, how each one scores on reliability, and which model years to skip.

M Performance2 generations, 2020 to 2026

Most reliableM340i G20 faceliftReliability 89 to 92Least reliableM340i G20Reliability 84 to 89Highest Guide Score2022 M340i G20Guide Score 71 Good Costliest known repairOil pump failure$2,600 on the M340i G20

Every M340i generation at a glance

Generation	Reliability	Costliest known repair	Best year
M340i G20 facelift2023 to 2026	89 to 92Excellent	Oil filter housing and valve cover gasket leaks$1,500	2026Score 69
M340i G202020 to 2022	84 to 89Strong	Oil pump failure$2,600	2022Score 71

Reliability is out of 100, for the range of a generation's model years: its engine, its own known problems and their bills, parts and service costs, and age. Repair figures are the guides' estimates for an independent shop, not quotes. How the scores work

Which M340i years to skip

Generation	Best year	Weaker years, and why
M340i G20 facelift2023 to 2026	2026 (69)	2023 and 2024 (Guide Score 68 to 69) score close to the best, but check for carbon buildup.
M340i G202020 to 2022	2022 (71)	2020 and 2021 (Guide Score 70) score close to the best, but check for oil pump failure.

Most of the gap between years is age. A year is listed when the score charges it for something specific: a different engine, a problem that hit only some years, or a gearbox that came later. The same list for every car is on the best and worst years.

Before you choose

Tip

A well-kept car from a weaker generation can be a better buy than a neglected one from the best. Each guide has the full problem list with how to check for each, and Score a listing rates one car for sale.

Every M340i generation at a glance

The worst known problems on each M340i

Which M340i years to skip

Before you choose