There had been a clear gap in Valmet's offerings in the larger class for a couple of years, since after the discontinuation of the Volvo BM-based models 2005 and 2105, the largest model had been the 905. Massey Ferguson chose Valmet as the engine supplier for their largest models, which led to a solution where MF manufactured tractors based on their 3600 series for Valmet.

The Valmet Mega 8300 and 8600 were introduced at the end of 1989. For the first time, they featured a hood and grille designed according to Valmet’s new styling line. The color was always white (although red versions were made later). The cab was also modified, especially in terms of color, to fit Valmet’s line-up. Unlike MF, the dashboard was black. The control panel for the electric lift was changed to match Valmet’s Autocontrol system, which meant that, for example, the raise-lower switch no longer had a stop position.

The MF-based Mega came in two models. The 8300 (140 hp) was naturally aspirated and the 8600 (170 hp) was turbocharged. Both had Valmet’s 7.4-liter engine. There were small technical differences compared to the MF models. The slowest speed of the 8600’s gearbox was unusually high. Apparently, for some reason, the gear ratios were modified to speed up the 30 km/h version to run at 40 km/h. Valmet claimed a tighter turning radius than MF but a higher noise level.

During the years 1992-93, the 8300T was offered, with an output of 155 hp. From 1994 to 1996, the 8800 model was manufactured, where the power was raised from the 8600’s 170 horsepower to 190. Compared to before, the number of gears was now doubled thanks to MF’s 4-speed powershift marketed under the name Dynashift. The clutch was a wet multi-plate clutch.

In 1997, the short-lived MF 8160 parallel model, the Valmet 8850 (200 hp), replaced the 8800. It featured the new cab from the MF 8100 series. The 8850’s rounded front was very different in appearance from previous models, as it came from Steyr, which sold the same tractor under the name Steyr 9200. The Valmet 8850 was available in red and white. The 8850 was sold only in France.

The Mega 8300/8600/8800 was a makeshift solution made with little effort, which was displaced as Valmet’s own larger models were introduced to the market.

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