Machter Auto

Diesel Engine Oil Cooler - Suitable For Toyota Land Cruiser HZJ80 HZJ77 HZJ76 HZJ74

$727.00 AUD

Sale Sold out

Taxes included. Shipping calculated at checkout.

Built for the Bush, Backed by Experts

Genuine Local Support: We aren't just a website; we’re 4WD enthusiasts based in Surry Hills, NSW.
Free Australia-Wide Shipping: We ship every order across the country at no extra cost to you.
Fitment Guarantee: We only stock gear we’ve tested on our own rigs to ensure it fits your Toyota perfectly.
Trusted AU Business: Proudly Australian owned and operated with a verified ABN: 83 685 124 949.

Diesel Engine Oil Cooler – Toyota LandCruiser HZJ80 HZJ77 HZJ76 HZJ74 (1HZ 4.2L)

Keep your oil temps in check and protect your engine on long hauls, heavy towing, or hot Aussie days with this high-quality diesel engine oil cooler for Toyota LandCruiser HZJ80, HZJ77, HZJ76, and HZJ74 models (4.2L 1HZ diesel). Direct replacement or upgrade for the factory unit – essential for work utes, troop carriers, wagons, or 4x4s that run hot under load, climb steep tracks, or sit in traffic around Sydney/regional NSW. Prevents oil breakdown, bearing wear, and expensive engine damage from overheating.

Key Features

Complete engine oil cooler assembly – includes core, lines/fittings (where applicable), and mounting brackets
Direct bolt-on fit for 1990-1998 HZJ80 (80 Series), HZJ77/HZJ76/HZJ74 (70 Series long wheelbase variants) with 4.2L 1HZ diesel
High-efficiency stacked-plate or tube-fin core – excellent heat dissipation even in extreme conditions
Aluminium construction with corrosion-resistant coating – lightweight, durable, and rust-proof
Reinforced hoses and banjo fittings – handles oil pressure and temperature cycling without leaks
Compatible with factory or aftermarket oil lines, thermostat housings, and sump setups
Meets or exceeds OEM specifications for flow rate, pressure drop, and cooling capacity

Benefits

Maintains optimal oil temperature – keeps viscosity stable for better lubrication under load or in 40°C+ heat
Reduces risk of oil breakdown & engine wear – protects bearings, camshaft, turbo (if fitted), and internals
Stops oil leaks from cracked or clogged factory cooler – cleaner engine bay and no fluid loss
Improves engine longevity – especially important for high-mileage 1HZ motors used for towing or remote work
Restores factory cooling performance – essential for roadworthy compliance and safe heavy-duty use in NSW
Great for work rigs, off-road builds, or resto projects – keeps your 70/80 Series running cool and strong

Fitment Notes

Suitable for Toyota LandCruiser with 4.2L 1HZ diesel: HZJ80 (80 Series 1990-1998), HZJ77 / HZJ76 / HZJ74 (70 Series variants)
Professional installation recommended – flush oil system, replace oil/filter, and check lines for leaks after fitting
Use fresh high-quality diesel engine oil (15W-40 CI-4 or better) – inspect thermostat/hoses while the cooler is off
May require minor line rerouting if upgrading to a larger aftermarket cooler – confirm your chassis code

Free shipping Australia-wide • 30-day returns • Built tough for real Aussie 4x4s

← Return to Cruiser Store Home

Frequently Asked Questions

What is the primary function of an engine oil cooler element? +

The engine oil cooler is a specialized internal heat exchanger assembly mounted inside the engine block's side housing loop. Its physical layout allows hot engine lubrication oil to flow past passages cooled by engine coolant. This mechanism lowers oil temperatures, maintaining correct fluid viscosity and protecting core engine bearings under high off-road loads and towing demands.

Which specific LandCruiser models and engine variants does this cooler fit? +

This replacement core is engineered specifically to suit Toyota's 4.2-litre 6-cylinder naturally aspirated 1HZ diesel engine configuration. It is a direct physical fit for classic heavy-duty variants including the LandCruiser HZJ80, HZJ74, HZJ76, and HZJ77 models, alongside Toyota Coaster buses utilizing the HZB40 and HZB41 platform layouts.

What are the catastrophic symptoms of a ruptured or corroded oil cooler? +

Because your engine's oil pressure operates at higher metrics than the cooling system, an internal breach causes oil to force its way into the cooling loop. The most prominent warning sign is a thick, milky-brown "chocolate milkshake" sludge accumulating under your radiator cap or inside the coolant overflow bottle. Conversely, it can also cause coolant to seep back into the oil pan sump when the engine is off, leading to engine oil contamination.

Why do these oil cooler cores fail on older high-mileage diesel engines? +

Over hundreds of thousands of touring kilometers, the thin metallic fins inside the cooler are subjected to continuous thermal stresses. If the engine's cooling system maintenance has been neglected, degraded anti-freeze or hard mineral water will cause localized electrolytic corrosion and scaling along the metal surfaces, eventually chewing through the internal core matrix walls.

What critical steps must be followed during installation to avoid a repeat failure? +

Proper execution during installation is absolute. You must use fresh, high-quality matching rubber O-rings and gaskets coated in a clean lubricant film to ensure a watertight and oil-tight seal against the housing cover plate. If your old unit ruptured, you must thoroughly flush the entire radiator and engine block plumbing using a professional cooling system degreaser to remove all sticky oil residue before filling it with fresh coolant.