Nissan Patrol 4.2 diesel: actual fuel consumption and how to optimize it

Nissan Patrol Y61 with diesel engine TD42 with a volume of 4.2 liters is a legendary SUV that is valued for its reliability, simplicity of design and ability to overcome any obstacles. However, owners are often faced with the question: what is the real fuel consumption of this “appetizing” giant? Official data from the manufacturer rarely coincides with practice, especially when it comes to a used car or one modified for off-road use.

In this article we will look at standard consumption indicators for different operating conditions, let's analyze why Patrol can “eat up” diesel fuel like a bottomless barrel, and we’ll give specific recommendations, how to reduce fuel consumption without sacrificing power. We will also collect reviews from real owners and compare consumption on different types of fuel (including biodiesel and arctic diesel fuel).

Official data vs reality: what consumption does Nissan claim?

According to factory specifications, Nissan Patrol Y61 with diesel TD42 (4.2 l, 116–165 hp) Depending on the year of manufacture and modification, it has the following consumption:

• 🛣️ City cycle: 14–16 l/100 km
• 🌳 Country cycle (road): 10–12 l/100 km
• ⚖️ Mixed cycle: 12–14 l/100 km

But there are several pitfalls here. Firstly, these figures are relevant for brand new car with perfectly adjusted fuel equipment. Secondly, the tests were carried out on European diesel fuel with a cetane number of at least 51, whereas in Russia and the CIS countries the quality of diesel fuel often leaves much to be desired. Thirdly, Patrol rarely used in “greenhouse” conditions - it is bought for off-roading, towing trailers and traveling with a full load, which automatically increases consumption by 20–40%.

According to independent tests (including measurements from owners on forums 4x4club.ru And patrol4x4.com), real indicators look like this:

Operating conditions	Consumption (l/100 km)	Notes
City (traffic jams, frequent stops)	18–22	Increases when air conditioning or heating is running
Route (90–110 km/h)	12–15	At speeds above 120 km/h, consumption increases to 16–18 l
Off-road (mud, sand, snow)	25–35	Depends on the track depth and all-wheel drive enabled
Towing a trailer (1.5–2.5 t)	20–28	When driving uphill, consumption can exceed 30 l/100 km

A critical feature of the TD42: the engine is extremely sensitive to the quality of the fuel and the condition of the fuel system. Clogged injectors or a worn fuel injection pump can increase fuel consumption by 30–50% even during quiet driving.

5 main reasons for increased fuel consumption

If your Patrol started to “eat” more than usual, first check these nodes:

• ⚙️ Wear of the high pressure fuel pump (HPF): Over time, the plunger pairs wear out, and the pump begins to “pour” diesel fuel into the return line without creating the required pressure. Symptoms: difficult starting, smoky exhaust, loss of power.
• 🔥 Clogged injectors: deposits on the nozzles disrupt the shape of the injection torch, and the fuel burns inefficiently. Often accompanied by “triple” at idle.
• 🌡️ Faulty thermostat or temperature sensor: if the engine does not warm up to operating temperature (85–95°C), the ECU enriches the mixture, increasing consumption by 10–15%.
• 🚗 Worn glow plugs: in the cold season, poorly functioning spark plugs force the driver to warm up the engine longer, which adds 1–2 liters per 100 km.
• 🛞 Incorrect tire pressure or non-standard wheel size: lower pressure increases rolling resistance, and “alloy” wheels with wide tires (for example, 33–35 inches) can add up to 3–4 l/100 km.

⚠️ Attention: If consumption suddenly increases by 20–30% for no apparent reason, check fuel line tightness from the tank to the injection pump. Air leaks are a common problem with old Patrol, which is difficult to diagnose without special equipment.

How to reduce fuel consumption: proven methods

Reduce "appetite" TD42 possible without major modifications. Here top 7 working methods, confirmed by the owners:

1. Adjustment of injection pump and injectors. Even a new pump requires adjustment after 100–150 thousand km. Optimal injection pressure for TD42 — 180–200 kg/cm². After adjustment, the flow rate drops by 10–15%.
2. Replacing the air filter. A clogged filter creates a vacuum, and the engine “chokes”, compensating for this by increasing the fuel supply. Change every 10–15 thousand km when driving on dusty roads.
3. Use of diesel additives. Means type Liqui Moly Diesel Spulung or Wynn’s Diesel System Cleaner Clean the injectors and combustion chamber. Effect: minus 1–2 l/100 km after full treatment.
4. Switch to synthetic oil. Low viscosity engine oil (e.g. 5W-40 or 0W-30) reduces friction, making engine operation easier. Especially relevant for winter use.

For those who are ready for more serious modifications:

• 🔧 Installation of a turbine (if there is none). Atmospheric TD42 can be equipped with a turbo kit from TD42T. This will add 30-40 hp. and will reduce consumption by 10–20% due to better filling of the cylinders.
• ⚡ Chip tuning. Reflashing the ECU for an “economical” program reduces consumption by 5–10%, but requires precise tuning, otherwise the engine will lose reliability.

Check the tire pressure (optimally 2.2–2.4 atm)

Fuel with a cetane rating of at least 51

Make sure the air filter is clean

Turn off unnecessary consumers (headlights, air conditioning)

Check the oil and coolant levels -->

The effect of fuel on consumption: what to fill in the TD42

Diesel TD42 undemanding to fuel, but it consumption and resource directly depend on the quality of diesel fuel. Here's what you need to know:

• 🛢️ Summer diesel fuel (L). Optimal for temperatures above +5°C. It has high viscosity and better lubricity, but when it gets colder it waxes.
• ❄️ Winter diesel fuel (Z). Depressant additives are added to prevent freezing down to -20°C. Consumption may increase by 3–5% due to lower energy consumption.
• ❄️ Arctic diesel fuel (A). For extreme frosts (down to -50°C). It burns worse, consumption increases by 5–10%, but there is no alternative in the northern regions.
• ♻️ Biodiesel (B5–B20). Mixtures of up to 20% biocomponent can be used, but only if the fuel system is adapted. Consumption increases by 2–3%, but carbon deposits decrease.

Important nuance: TD42 does not have a fine fuel filter in the tank (only a coarse mesh). Therefore the quality of diesel fuel is critical — small particles quickly damage the injection pump. It is recommended to install an additional filter with a settling tank (for example, Separ 2000).

⚠️ Attention: Never refill Patrol “burnt” diesel or fuel from unknown gas stations. Sulfur compounds in cheap diesel fuel destroy the seals of fuel injection pumps and injectors, which leads to oil starvation and scuffing on plunger pairs.

What happens if you pour gasoline into a diesel Patrol?

Even 5% gasoline in diesel fuel will lead to fuel injection pump breakdown (gasoline does not lubricate pump parts) and detonation in the cylinders. Symptoms: metallic knocking, white smoke from the exhaust pipe, loss of power. The only solution is to completely flush the fuel system and replace the filters.

Owner reviews: real consumption figures

We analyzed reviews from forums and groups on social networks (including Drive2.ru And Facebook communities) and collected typical flow rates for different conditions:

Model and year	Terms	Consumption (l/100 km)	Owner's comment
Patrol Y61 1995, TD42	City (Moscow, traffic jams)	20–22	“After replacing the injection pump and injectors, the consumption dropped from 24 to 20 liters. I'm going to Gazpromneft Diesel Opti.»
Patrol Y61 2000, TD42T (turbo)	Highway (100–110 km/h)	13–14	“With the turbine it goes like a rocket, but if I don’t press the pedal to the floor, I get 13 liters.”
Patrol Y61 1998, TD42	Off-road (clay, snow)	30–35	“In the mud, the consumption goes through the roof, but the main thing is that it leaves where others stop.”
Patrol GR Y61 2010, TD42 (restyling)	Mixed cycle	15–17	“After chip tuning and installing an intercooler, consumption decreased by 1.5 liters.”

Fun fact: the owners Patrol in the UAE and Saudi Arabia (where fuel quality is higher and the climate is hot) they report consumption in 10–12 l/100 km on the highway. This confirms that climate and fuel play a key role.

Comparison with competitors: who is more economical?

For objectivity, let's compare Nissan Patrol 4.2 diesel with similar SUVs in terms of fuel consumption:

• 🚙 Toyota Land Cruiser 80 (1HD-T, 4.2 diesel): 13–16 l/100 km. A more modern engine with a turbine, but less maintainable.
• 🚙 Mitsubishi Pajero 3.2 Di-D: 11–14 l/100 km. More economical, but weaker off-road.
• 🚙 Land Rover Defender Td5: 12–15 l/100 km. Good balance, but the electronics are finicky.
• 🚙 Mercedes-Benz G-Class (OM617, 3.0 diesel): 14–18 l/100 km. Reliable, but expensive to maintain.

Patrol loses in efficiency, but wins in simplicity of design And maintainability. For example, major renovation TD42 costs 2–3 times less than restoration 1HD-T from Toyota.

Frequently asked questions about fuel consumption of Nissan Patrol 4.2

Why is fuel consumption higher in winter than in summer?

Main reasons:

1. Longer engine warm-up (a cold engine consumes 20–30% more fuel).
2. Using winter diesel fuel with additives, which is less energy intensive.
3. Increased transmission resistance due to thickened oil.
4. Operation of the interior heater and heaters (fuel heating increases consumption by 1–2 l/100 km).

To reduce consumption, use preheater (For example, Webasto) and synthetic oil with low temperature properties (0W-30 or 5W-40).

Is it possible to reduce consumption by installing gas equipment (LPG) on Patrol 4.2?

Technically yes, but with reservations:

• ✅ Pros: propane-butane is 30–50% cheaper than diesel fuel, gas consumption is ~20–25 l/100 km (equivalent to 15–18 l of diesel).
• ❌ Cons:
  • Reduction in power by 10–15% (gas octane number is lower than the cetane number of diesel).
  • Risk of overheating of the valves (gas burns at a higher temperature).
  • The need for regular adjustment of the gas equipment (every 10–15 thousand km).

For TD42 fits better methane (less explosive and retains power), but its refills are rare. The best option is hybrid system (diesel + gas), where gas is used on the highway, and diesel fuel is used for starting and off-road.

What is the fuel consumption of Patrol 4.2 diesel with automatic transmission?

Nissan Patrol Y61 with TD42 officially completed only manual transmission (5-speed FS5R30A). Automatic transmission (RE4R01A) was installed only on gasoline versions (TB42, TB45) or diesels TD42T (turbo) for some markets (eg Middle East).

If your Patrol is equipped with an automatic transmission, then the consumption will be 10–15% higherthan a manual transmission, due to the torque converter. Typical indicators:

• City: 22–25 l/100 km
• Highway: 14–16 l/100 km

To reduce consumption it is recommended:

• Use mode Overdrive (O/D) on the highway.
• Avoid sudden accelerations (the torque converter “eats” a lot of fuel when slipping).
• Change the automatic transmission oil regularly (every 60 thousand km).

Is it worth switching to biodiesel to save money?

Use of biodiesel (e.g. B5–B20) on TD42 possible, but with some caveats:

• ✅ Pros:
  • Reduced soot and CO₂ emissions.
  • Better lubricity (extends the life of the injection pump).
  • In some regions, biodiesel is cheaper than traditional diesel fuel.
• ❌ Cons:
  • Consumption increases by 2–5% (lower energy intensity).
  • Biodiesel is aggressive to rubber seals (the hoses need to be replaced with fluoroplastic ones).
  • At temperatures below -10°C it can become waxy (special additives are required).

If you decide to switch to biodiesel, start with 5% mixture (B5) and monitor the condition of the fuel system. Full transition to B100 possible only after modification of the motor (replacement of seals, ECU firmware).

What is the fuel consumption of the Patrol 4.2 diesel when towing a trailer?

When towing a trailer weighing 1.5–2.5 tons fuel consumption increases by 30–50% depending on terrain and speed. Typical indicators:

Trailer weight	Terms	Consumption (l/100 km)
1.5 t	Route (90 km/h)	16–18
2.0 t	Mountain (ascent 5–7%)	25–30
2.5 t	Off-road (sand, mud)	35–40

To reduce fuel consumption when towing:

• Use downshift (for manual transmission - 4th or 5th, for automatic transmission - mode L or 2).
• Maintain your speed 70–80 km/h (optimal balance between aerodynamics and load).
• Check trailer tire pressure (should be 0.2–0.3 atm higher than in car tires).