In the summer of 2003, alongside the T-series, corresponding 4-cylinder models called the M-series were introduced. The most powerful model in the lineup, the M150, was the second 150 hp class four-cylinder engine after the Fendt Xylon. The other models were the M120, M130, and the low-speed model M120e. All models were equipped with the SisuDiesel 44EWA engine featuring an electronically controlled distributor pump. The transmission was the familiar HiTech with a three-speed powershift and two different types of powershift automation. The hydraulics, with free-circulation valves and electronically controlled valve blocks, matched those of the T-series. The cab was also the same as in the T-series, with a reported noise level of 73.5-75 dB, and 71.5 dB in the low-speed model. The cab shown in the picture is equipped with TwinTrac rear control devices, with the control armrest on the left side. The front axle on the M-series was Dana on all models.

The Valtra M was a model whose features raised eyebrows. Weighing 5130-5450 kg, with a length of 490 cm and a height of 297 cm, it had dimensions that few six-cylinder machines in the same power category exceeded. Additionally, the weight distribution of 50/50 was unsuccessful for many types of work. Only a little over two years later, the N-series was introduced, with features that were significantly better suited, and the M-series was phased out from markets such as Finland. However, frame-steered parallel models (the XM-series) continued on the market for a little while longer.

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