Which Oldsmobile Series 70 Version Should You Buy?
The Oldsmobile Series 70 catalogue data presents three choices: the first-generation 3.8 MT coupe from 1939–1940, the second-generation 3.8 MT coupe from 1941–1948, and the third-generation 4.2 AT Estate 5-door from 1949–1950.
The Oldsmobile Series 70 catalogue data presents three choices: the first-generation 3.8 MT coupe from 1939–1940, the second-generation 3.8 MT coupe from 1941–1948, and the third-generation 4.2 AT Estate 5-door from 1949–1950. The later 4.2 AT is the strongest and the only Automatic estate, while the second-generation 3.8 MT offers more power than the earlier car without changing the basic Manual coupe configuration. Buyers should therefore choose by intended body style and gearbox first, then compare engine output.
Oldsmobile Series 70 generations compared
First generation: 1939–1940
The first-generation Oldsmobile Series 70 is listed as a Coupe with one version, 3.8 MT. Its 3,764 cc Gasoline engine has 6 Inline cylinders and produces 95 hp (71 kW) at 3,300 rpm. The engine is Front, longitudinal, while the 3-speed Manual transmission sends power to RWD. Dependent, leaf spring suspension is specified at both ends, and the front brakes are Drum.
This is the earliest and least powerful choice in the data. Its calculated specific output is approximately 25.2 hp per litre. It suits a buyer specifically seeking the 1939–1940 generation rather than the highest output or an Automatic transmission.
Second generation: 1941–1948
The second generation is also a Coupe with one version called 3.8 MT. To distinguish it from the identically named earlier version, this is the 99 hp (73 kW) 3.8 MT, produced from 1941–1948. Its 3,840 cc Gasoline engine has 6 Inline cylinders and develops maximum power at 3,450 rpm. It retains a Front, longitudinal engine, 3-speed Manual gearbox, and RWD.
Compared with the 1939–1940 3.8 MT, the second-generation car gains 4 hp and 2 kW from an additional 76 cc. Its specific output is approximately 25.8 hp per litre, about 0.6 hp per litre higher than that of the first-generation version. Its maximum-power point is also 150 rpm higher. Dependent, leaf spring suspension remains specified at the front and rear, with Drum front brakes.
For someone choosing between the two coupes solely from these figures, the 1941–1948 3.8 MT is the stronger option while preserving the same fuel type, cylinder arrangement, gearbox type, gear count, and drive layout.
Third generation: 1949–1950
The third generation changes the proposition substantially. It is an Estate 5-door with one version, 4.2 AT, rather than another Coupe. The 4,170 cc Gasoline engine has 6 Inline cylinders and produces 110 hp (80 kW). It is mounted Front, longitudinal and paired with a 4-speed Automatic transmission and RWD.
Against the second-generation 99 hp 3.8 MT, the 4.2 AT adds 11 hp and 7 kW while increasing displacement by 330 cc. Against the first-generation 95 hp 3.8 MT, it adds 15 hp and 9 kW from an additional 406 cc. Its calculated specific output is approximately 26.4 hp per litre, the highest of the three listed versions.
The third generation retains Dependent, leaf spring suspension at both ends and Drum front brakes. Its main buying advantages are therefore clear in the supplied specifications: the highest power, the largest displacement, an extra forward gear, an Automatic transmission, and an Estate 5-door body.
Oldsmobile Series 70 engine and specs
| Generation and years | Exact version | Power | Torque | Displacement | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|---|
| First, 1939–1940 | 3.8 MT, 95 hp | 95 hp / 71 kW at 3,300 rpm | not measured | 3,764 cc | Gasoline | 6 | Inline | not measured | 3-speed Manual | RWD |
| Second, 1941–1948 | 3.8 MT, 99 hp | 99 hp / 73 kW at 3,450 rpm | not measured | 3,840 cc | Gasoline | 6 | Inline | not measured | 3-speed Manual | RWD |
| Third, 1949–1950 | 4.2 AT, 110 hp | 110 hp / 80 kW; rpm not measured | not measured | 4,170 cc | Gasoline | 6 | Inline | not measured | 4-speed Automatic | RWD |
All three engines share the specified Gasoline fuel type, 6-cylinder Inline layout, and Front, longitudinal installation. The catalogue does not measure boost, torque, torque rpm, valves per cylinder, fuel-system type, compression ratio, or bore and stroke for any version.
The calculated power ranking is 4.2 AT at 110 hp, the second-generation 3.8 MT at 99 hp, and the first-generation 3.8 MT at 95 hp. The corresponding approximate outputs per litre are 26.4, 25.8, and 25.2 hp. These differences are modest, so the Estate 5-door body and Automatic gearbox distinguish the latest version more decisively than specific output alone.
Performance, mpg, and economy
Acceleration from 0–100 km/h is not measured for the 95 hp 3.8 MT, the 99 hp 3.8 MT, or the 110 hp 4.2 AT. Top speed is also not measured for any version.
City fuel consumption is not measured for all three versions. Highway fuel consumption is not measured, and combined fuel consumption is not measured. Consequently, the supplied data cannot support an mpg comparison or establish which version is more economical.
Fuel grade, CO₂ emissions, and environmental class are not measured for any version. Although displacement and power can be compared, neither figure alone establishes real-world fuel consumption.
Dimensions, weight, tank, and wheels
Kerb weight and gross weight are not measured for either 3.8 MT or for the 4.2 AT. Weight per horsepower therefore cannot be calculated reliably. The 110 hp version has the most power, but the data does not show whether it has the best power-to-weight ratio.
Ground clearance is not measured for any version. Fuel-tank capacity is not measured, and wheel sizes are not measured. The supplied catalogue data also provides no exterior dimensions, so length, width, height, and wheelbase cannot be compared.
What can be compared is body configuration: the 1939–1940 and 1941–1948 cars are Coupe models, whereas the 1949–1950 car is an Estate 5-door. No unsupported claim about cabin space or cargo capacity can be made from body designation alone.
Suspension, brakes, reliability, and problems
Every listed Oldsmobile Series 70 version uses Dependent, leaf spring front suspension and Dependent, leaf spring rear suspension. Front brakes are Drum on the 95 hp 3.8 MT, the 99 hp 3.8 MT, and the 110 hp 4.2 AT. Rear-brake type is not measured for any version.
Reliability records and known-problem data are not supplied. The specifications therefore do not justify calling one generation more reliable or assigning particular problems to any version. Inspection condition, repair history, and parts availability also cannot be compared from the provided figures.
Which Oldsmobile Series 70 version should you choose?
Choose the first-generation 95 hp 3.8 MT if the 1939–1940 Coupe is the specific generation you want. It provides the earliest configuration, but it is 4 hp behind the later 3.8 MT and 15 hp behind the 4.2 AT.
Choose the second-generation 99 hp 3.8 MT if you want the stronger of the two Manual coupes. It adds 4 hp from 76 cc over the first-generation 3.8 MT, while retaining the 3-speed Manual gearbox, RWD, Coupe body, 6 Inline cylinders, and Front, longitudinal engine position.
Choose the third-generation 110 hp 4.2 AT if specification breadth matters most. It has the largest engine, the highest output, the highest calculated power per litre, a 4-speed Automatic instead of a 3-speed Manual, and the catalogue’s only Estate 5-door body. Compared with the second-generation 3.8 MT, the increase buys 11 hp, 7 kW, 330 cc, and one additional transmission ratio in numerical terms.
The data contains no prices, sale listings, performance measurements, economy figures, weights, or reliability records. It therefore cannot determine value for money or operating cost. On the available evidence, the second-generation 99 hp 3.8 MT is the logical Coupe choice, while the 110 hp 4.2 AT is the clear choice for maximum output, an Automatic transmission, and an Estate 5-door body.