After lengthening its stroke from 136 to 147 mm, its displacement was enlarged to 10.8 litres and the engine renamed M11, later ISM.
The L10 was Cummins's first competitive offering in the British bus market, as their earlier production had been too large and heavy.
[1] However, it had a troublesome introduction to the British market, with high oil consumption and sealing problems.
The ISL engines were manufactured at plants in Rocky Mount, North Carolina and Darlington, England.
In February 2023, Cummins announced that the L9, alongside the X12, would be replaced by the X10 engine, which is slated for introduction in 2026 for the North American market.