What is the correct oil to use in an 80’s era 6.9 Ford Diesel?

How much oil does a 6.9 diesel hold?

Ford 6.9L IDI Diesel Fluid Capacity

Oil/Fluid Capacity – Quarts
Engine Oil /w Filter 10 Quarts
Auto Transmission Fluid 3-Speed Auto C-6 4-Speed Auto A0D See Below 12-13.5 Quarts 12.3 Quarts
Manual Transmission Fluid T-19 4-Speed Manual ZF 5-Speed Manual See Below 3.5 Quarts 3.38 Quarts
Transfer Case BorWarner 1345 3.25 Quarts

What does diesel in oil look like?

Diesel oil will always look blackish and never golden after being changed in an engine. It is because the old oil residue left when the oil is changed will always cause a discoloration and will always retain a certain amount of contamination.

How much horsepower does a 6.9 diesel have?

6.9L IDI Diesel Engine Specs

Years: 1983-1987
Fuel: Diesel
Fuel Capacity: 16.5 or 19 Gallon Front 19 Gallon (Behind Axle)
Horsepower (Varies): 1983 1984-1987 See Below 161 Horsepower @ 3,300 rpm 170 Horsepower @ 3,300 rpm
Torque (Varies): 1983-1986 1987 See Below 307 lb-ft @ 1,800 rpm 315 lb-ft @ 1,400 rpm

What years did Ford use the 6.9 diesel?

The engine was built in two displacements: 420 cubic inches (6.9 L), which was used in Ford trucks from 1983 until 1987, and 444 cubic inches (7.3 L), which was used in Ford trucks from 1988 until 1994 (naturally aspirated) and in 1993 and 1994 (turbocharged).

Why does diesel oil turn black so quickly?

Quite simply, it’s soot, which diesel engines produce in much higher levels than their gas-burning counterparts. The soot enters the oil pan from the combustion chamber due to the gap in the piston rings, and it takes very little soot to turn the oil the inky black diesel mechanics are all to familiar with.

Why does diesel oil go black straight away?

If your diesel oil goes black quickly after an oil change then quite clearly, the engine is definitely not clean and likely to be contaminated with soot and sludgy deposits. This can even happen on low mileage vehicles!

Why is my oil still black after an oil change?

Why is my Diesel Oil Black? So when your mechanic changes the oil in your car, the golden amber liquid is quickly darkened by the residual oil and carbon build-up in the engine.

How much power can a 6.9 Idi make?

6.9L IDI Specs

Engine: International Harvester 6.9L IDI V-8 diesel
Injection: Indirect injection (IDI), mechanical injectors, Stanadyne rotary style injection pump
Valvetrain: 2 valves per cylinder, standard OHV, camshaft in block
Peak Horsepower: 170 hp @ 3,300 rpm
Peak Torque: 318 lb-ft @ 1,400 rpm

What is the best diesel engine Ford ever made?

#2 – 6.7L Power Stroke – (Best Ford Diesel Engine)

Ford’s 6.7L diesel served as the first engine of Power Stroke lineage not to be produced by International Navistar.

What diesel engine did Ford use 1986?

IDI engine

This 1986 Ford F-250 Diesel was among the first generation to use the IDI engine, a predecessor to the modern Power Stroke V8. [Photo: TFLtruck] Enter a classic F-Series: a 1986 Ford F-250 with a 6.9-liter IDI diesel engine.

Are IDI diesels good?

Is the 7.3 IDI a good engine? Yes, the Ford (International/Navistar) 7.3 IDI is a dependable and robust diesel engine. With few generational problems, the IDI engine family is known for its long-lasting reliability. Although it lacks power, the 7.3 IDI will run forever if taken care of.

When did Ford stop using the 6.9 diesel?


The 6.9L was replaced by the 7.3L IDI in 1988, which acquired turbocharging in it’s final year of production, 1994.

What is a 6.9 IDI diesel?

The 6.9L IDI is a naturally-aspirated all-mechanical diesel engine. IDI stands for its ‘indirect injection’ fuel system, which features a mechanical rotary injection pump and mechanical injectors. Original engines never came with a turbo, but many owners added aftermarket Banks turbochargers to increase power.

How heavy is a 6.9 Idi?

The site calls the wieght for the 6.9 out at 860# and the 7.3 at 920#.

Who made the Ford 6.9 diesel?

International Harvester

Nearly 1.5 million 6.9L and 7.3L IDI engines were produced by International Harvester (now known as Navistar International). They are truly one of the cornerstones of the growth of diesel power for pickup engines.