The John Deere 790 takes 4.3 quarts / 4.1 litres of engine oil.
John Deere 790 Oil Capacity and Type
Engine Oil Capacity
4.3 qt / 4.1 L
Recommended Oil Name
John Deere Plus-50 II or Torq-Gard
Recommended Oil Type
15W-40 diesel engine oil
Cold Weather Oil
10W-30 diesel engine oil
Engine
Yanmar 3TNE82 3-cylinder diesel
Displacement
81.1 ci / 1.3 L
Cylinders
3-cylinder diesel
Cooling System
Liquid-cooled
Rated RPM
2600 rpm
Oil Change Interval
Initial service at 50 hours, then every 200 hours
How Much Oil Does a John Deere 790 Take?
The John Deere 790 takes 4.3 quarts / 4.1 litres of engine oil.
Use 15W-40 diesel engine oil for normal conditions. In colder weather, use 10W-30 diesel engine oil.
Fill slightly under 4.3 quarts first, run the tractor, let it settle, then check the dipstick and top up. Do not overfill it.
Quick Specs Overview
4.3 qtEngine Oil
15W-40Diesel Oil
200 hrsOil Interval
27 HPGross Power
Best Oil to Use
John Deere Plus-50 II 15W-40 diesel engine oil
John Deere Torq-Gard diesel engine oil
Any quality diesel-rated 15W-40 engine oil
10W-30 diesel oil for colder operating conditions
Replace the engine oil filter during oil service
Oil Capacity Comparison
790
4.3 qt
770
3.8 qt
870
5.0 qt
990
5.0 qt
Oil Change Intervals
Initial Engine Oil Service
After first 50 hours
Engine Oil
Every 200 hours after initial service
Engine Oil Filter
Replace with engine oil service
Hydraulic Oil Filter
After first 50 hours, then every 500 hours
Air Filter
Check regularly; replace as needed
Other John Deere 790 Fluid Capacities
Engine Oil
4.3 qt / 4.1 L
Coolant Capacity
5 qt / 4.7 L
Fuel Tank
6.3 gal / 23.8 L
Hydraulic System
4 gal / 15.1 L
Front Differential
2.32 qt / 2.2 L
John Deere 790 Engine Specs
Engine
Yanmar 3TNE82 diesel
Displacement
81.1 ci / 1.3 L
Power
27 HP / 20.1 kW
Cylinders
3-cylinder
Cooling System
Liquid-cooled
Compression Ratio
18.5:1
Rated RPM
2600 rpm
Starter
12 volt electric
John Deere 790 Hydraulic Specs
Hydraulic Type
Open center
Hydraulic Capacity
4 gal / 15.1 L
Hydraulic Pressure
2050 psi / 141.3 bar
Pump Flow
5.4 gpm / 20.4 L/min
Steering Flow
4.2 gpm / 15.9 L/min
Common Mistakes
Overfilling past the 4.3 quart oil capacity
Using gasoline mower oil instead of diesel-rated oil
Confusing engine oil with hydraulic/transmission oil
Skipping the first 50-hour oil and filter service
Not checking the dipstick after the engine has run and settled
Summary
The John Deere 790 takes 4.3 quarts / 4.1 litres of engine oil. Use 15W-40 diesel engine oil for normal use, or 10W-30 diesel oil in colder conditions. The 790 uses a Yanmar 3TNE82 3-cylinder diesel engine, has a 5 quart coolant capacity, a 6.3 gallon fuel tank, and a 4 gallon open-center hydraulic system.
