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Generac 3.9DTA Engine

The Generac 3.9DTA is a 3.9 L 4-cylinder turbocharged/aftercooled engine rated at 1800 rpm, producing up to 120 kW. It powers generator sets from Generac, including the SD060 and SD080. It holds 18 L (4.8 gal) of oil and 6.4 L (1.7 gal) of coolant.

Also known as: GENERAC 3.9DTA

3.9 L
Displacement
4
Cylinders
1800 rpm
Rated speed
120 kW
Gross power

Engine specifications

Oil capacity18.0 L
Coolant capacity6.4 L
Displacement3.9 L
Cylinders4
Aspirationturbocharged/aftercooled
Rated speed1800 rpm
Gross power120 kW

Generator sets powered by this engine

2

This engine also powers 6 machine(s) on Power Equipment Info.

How to read your Generac engine serial & model number →

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—
Fuel filter—100 hr
Oil filter—100 hr
Battery—100 hr
Belt—100 hr
Coolant15.9 liters—100 hr
Oil18.0 liters—100 hr
Spark plug—100 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

What is the oil capacity of the Generac 3.9DTA?

The Generac 3.9DTA engine has an oil capacity of 18.0 liters.

What is the displacement of the Generac 3.9DTA?

The Generac 3.9DTA has a displacement of 3.9 liters with 4 cylinders.

Which generators use the Generac 3.9DTA engine?

The Generac 3.9DTA powers 2 generator set(s), including Generac SD060, Generac SD080.

How often should you change the oil in the Generac 3.9DTA?

The Generac 3.9DTA oil change interval is every 100 hours.