After the Modern Oliver 70, the Hart-Parr 18-27 and 28-44 models were updated on a smaller budget into the Oliver 80 and 90 models. The design of these models did not receive more investment than that of competitors. The 80 featured a 4-cylinder 5.5-liter Waukesha-Oliver petrol or gasoline engine with a power output of 35-43 hp. The transmissions offered were either 3+1 or 4+1. The 90 had a 7.3-liter 50-horsepower petrol engine. Its parallel model was the 99, a 63-horsepower gasoline version. The most significant innovation in the 90 and 99 compared to the preceding 28-44 was electric starting.

The 80 was available both as a Row-Crop model with narrow front wheels placed side by side and as a Standard version with a wide front axle. The 90 and 99 were available as Standard or Industrial models. Initially, all models were offered with either steel or rubber tires.

In 1940, the 80 Diesel was introduced, initially equipped with a 3.7-liter Buda-Lanova engine and later with Oliver’s own diesel engine. However, production numbers remained around one hundred units.

In Canada, Oliver tractors were sold by Cockshutt, painted red.

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