Mercedes-Benz GLS build years & generations
The Mercedes-Benz GLS spans several build years and named generations (2013-present). Match a build year to its generation, then see how each group of build years does at its MOT.
Which year is which
Build years & generations, side by side
Find the build years you're looking at and see which generation they are. You'll also see which group of build years the MOT figures come from.
Built 2013-2016
- Generation
- X166 (GL/GLS)
- Figures from
- cars built 2013-2016
Counted with this generation only.
Built 2017-2019
- Generation
- X166 (GL/GLS)
- Figures from
- cars built 2017-2020
Counted together with X166 (GL/GLS) and X167 cars built in the same years.
Built 2020
- Generation
- X167
- Figures from
- cars built 2017-2020
Counted together with X166 (GL/GLS) and X167 cars built in the same years.
Built 2021+
- Generation
- X167
- Figures from
- cars built 2021 onwards
Counted with every car built from 2021.
“Figures from” is the group of build years behind each card's MOT figures. Years where one generation gave way to the next can sit in a wider group until there's enough history to split them.
By build-year group
How each group of build years performs
Each card shows MOT results for one group of Mercedes-Benz GLS build years. “Age” means the car's age on the day of its MOT, not its build year. “25+” groups every test on cars aged 25 or older.
Built2021 onwards
X167 only
All X167 cars built from 2021. Newer cars join this group until there is enough MOT history to split it.
Fail rate at 4 years old (latest age)
13.4%
UK average for cars this age: about 1 in 8 (12.5%)
Ages with data
3 to 4 years old
MOT tests counted
607
Chart shows
Age at the MOT
Not the build year
2021 onwards
X167 only
All X167 cars built from 2021. Newer cars join this group until there is enough MOT history to split it.
Fail rate at 4 years old (latest age)
13.4%
UK average for cars this age: about 1 in 8 (12.5%)
Ages with data
3 to 4 years old
MOT tests counted
607
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 3 years old.
Built2017-2020
A mix of X166 (GL/GLS) and X167
These build years include both X166 (GL/GLS) and X167 cars, so the figures are less exact than for a single generation.
Fail rate at 7 years old
11.6%
UK average for cars this age: about 1 in 6 (17.1%)
Ages with data
4 to 8 years old
MOT tests counted
2,126
Chart shows
Age at the MOT
Not the build year
2017-2020
A mix of X166 (GL/GLS) and X167
These build years include both X166 (GL/GLS) and X167 cars, so the figures are less exact than for a single generation.
Fail rate at 7 years old
11.6%
UK average for cars this age: about 1 in 6 (17.1%)
Ages with data
4 to 8 years old
MOT tests counted
2,126
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 5 years old.
Built2013-2016
X166 (GL/GLS) only
These build years are all X166 (GL/GLS), so the figures are almost all from that generation.
Fail rate at 9 years old (latest age)
15.7%
UK average for cars this age: about 1 in 5 (21.1%)
Ages with data
8 to 9 years old
MOT tests counted
384
Chart shows
Age at the MOT
Not the build year
2013-2016
X166 (GL/GLS) only
These build years are all X166 (GL/GLS), so the figures are almost all from that generation.
Fail rate at 9 years old (latest age)
15.7%
UK average for cars this age: about 1 in 5 (21.1%)
Ages with data
8 to 9 years old
MOT tests counted
384
Chart shows
Age at the MOT
Not the build year
Fail rate is the share of MOT tests that ended in a fail. Retests count as tests. How we count fail rates Highest fail rate at 9 years old.