Genuine Toyota Engine Oil Cooler Cover 15721-17012 1572117012 For Land Cruiser HZJ79/HZJ78/HZJ71/Coaster 1HZ 4.2L Diesel — OEM Aluminum Oil Filter Housing Cover

The Engine Oil Cooler Cover (COVER, OIL COOLER) with Genuine Toyota OEM number 15721-17012 (also listed as 1572117012) is a verified direct-fit replacement for a wide range of Toyota Land Cruiser and Coaster models equipped with the 1HZ 4.2L diesel engine.
This aluminum cover is a critical component of the engine's oil cooling and filtration system, serving as the mounting base for the oil filter and housing the oil cooler assembly. It provides a sealed, durable surface that maintains proper oil pressure and flow while withstanding extreme engine temperatures and vibration.

• OEM Specification — Verified by Genuine Toyota part number 15721-17012 and 1572117012
• Proven Durability — Constructed from high-quality aluminum for superior heat dissipation, corrosion resistance, and weight reduction
• Verified OEM Fitment — Confirmed for Toyota Land Cruiser HZJ79, HZJ78, HZJ71, and Coaster models with 1HZ engines from 1999-2023
• OEM Cross-Reference Verified — Replaces 15721-17022 (Pakistan spec with high altitude compensator)
• Critical Sealing Surface — Provides precision-machined flat surface for oil filter gasket (15725-17010) to ensure leak-free seal

As a Genuine Toyota OEM part, each oil cooler cover meets Toyota's stringent quality standards.

Pre-Installation Checklist:

• Allow the engine to cool completely before starting work
• Drain the engine oil completely
• CRITICAL: Order the oil filter gasket (15725-17010) separately — it is not included with the cover
• Clean the engine block mating surface thoroughly — any debris can cause premature gasket failure
• Inspect the oil cooler core and oil filter for damage — replace if necessary

Installation Guidelines (Reference Toyota workshop manual):

1. Ensure the engine is cool and drain the engine oil completely
2. Disconnect the negative battery terminal
3. Remove the oil filter and set it aside (or replace with new unit)
4. Remove the mounting bolts securing the oil cooler cover to the engine block
5. Carefully remove the old cover and old gasket
6. CRITICAL: Clean the engine block sealing surface thoroughly with appropriate solvent
7. Position the new oil filter gasket (15725-17010) onto the engine block
8. Install the new oil cooler cover and hand-tighten the mounting bolts
9. CRITICAL: Torque the mounting bolts to manufacturer's specified torque settings
10. Install a new oil filter and refill with fresh engine oil of correct specification
11. Start the engine and check for oil leaks around the cover and oil filter
12. Check the oil level after the engine reaches operating temperature

Maintenance Schedule:

• Inspection: Every 50,000 km / 12 months. Check for oil leaks around the oil cooler cover and oil filter mounting surface
• Replacement: Immediately if oil leaks are detected or if the cover shows signs of cracking, warping, or corrosion
• Note: Always replace the oil filter gasket (15725-17010) whenever the oil cooler cover is removed

• Packaging: Each oil cooler cover is securely packed in Genuine Toyota OEM packaging
• Weight: Approx. 2.90 lbs (1.32 kg)
• Note: Oil filter gasket (15725-17010) is sold separately
• Suitable for: Wholesale distributors, auto parts retailers, 4×4 specialty shops, commercial vehicle repair shops, and fleet owners