Complete Oil Specifications
Your 2023 Land Rover Defender 3.0L Ingenium P400 requires 0W-20 full synthetic oil meeting the Jaguar Land Rover STJLR.51.5122 (SLX-Professional) specification. This Ingenium inline-six is an entirely different engine family from the older AJ126 supercharged V6 — it carries a 48-volt mild-hybrid system and takes 9.3 quarts with filter, substantially more than predecessor engines.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-20 |
| API Rating | STJLR.51.5122 (SLX-Professional) |
| ILSAC Rating | STJLR.51.5122 |
| Capacity (with filter) | 9.3 quarts |
| Oil Filter | Land Rover LR133455 |
| Normal Interval | 16000 miles |
Why 0W-20 is Critical for This Engine
The Ingenium I6 combines a twin-scroll turbocharger, direct injection, and a 48V belt-integrated starter-generator. The MHEV system frequently shuts down and restarts the engine under deceleration, increasing the number of cold-start lubrication events per mile. 0W-20 minimises the oil-starvation window during these micro-restarts while meeting the low-SAPS requirement to protect modern catalyst systems.
Using incorrect oil will:
- ❌ Increase wear during the frequent MHEV engine stop-start events
- ❌ Potentially overfill or underfill by 2–3 quarts if using AJ126 V6 capacity figures
- ❌ Contaminate the catalytic system with excess sulfated ash from non-STJLR-approved oils
Land Rover-Approved Oil Brands
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✅ Castrol EDGE Professional Longlife IV FE 0W-20
-
✅ Mobil 1 ESP X2 0W-20
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✅ Shell Helix Ultra Professional AV-L 0W-20
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✅ Pennzoil Platinum Full Synthetic 0W-20
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✅ Liqui-Moly Special Tec F ECO 0W-20
Confirm the STJLR.51.5122 or SLX-Professional approval appears on the container. Do not substitute based on viscosity alone — the additive package matters.
Severe Service Check
You need the 8000-mile interval if you:
- Use the Defender for sustained off-road driving, wading, or rock crawling
- Tow at or near maximum capacity regularly
- Drive in extreme dust or sand conditions (filter contamination risk)
- Operate in sustained low-speed, high-load terrain (engine thermal cycling)
Installation Details
Drain Plug Torque: 26 ft-lbs
Replace the aluminium drain plug seal at every oil change. The Defender’s underbody protection may need partial removal to access the drain plug cleanly — consult JLR service documentation for your specific trim level.
OEM Filter: Land Rover LR133455
Aftermarket Filters:
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Mahle OX 1073D
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Mann-Filter W 811/94
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Bosch 0451103370
Pro Tip: The P400 uses a spin-on filter with a top-hat adapter. Pre-fill the new filter before installation to reduce the oil-starvation window on first startup after a change.
FAQs
What oil does a 2023 Land Rover Defender 3.0L P400 take? 0W-20 full synthetic oil certified to the Jaguar Land Rover STJLR.51.5122 (SLX-Professional) standard.
How many quarts does it need? 9.3 quarts with a new filter, 8.8 without.
Can I use 5W-30 ACEA C3 instead? No. The Ingenium P400 requires 0W-20 with STJLR.51.5122 approval. 5W-30 C3 may be listed for older Land Rover engines; using it in this engine will underfill by a significant margin and may void warranty.
Is full synthetic required? Yes — STJLR.51.5122 is a full-synthetic specification only.
How often should I change the oil? Every 16000 miles under normal conditions. Reduce to 8000 miles for heavy off-road or towing use.
Does the MHEV system require any special oil considerations? Yes — the frequent stop-start events of the 48V mild-hybrid system make cold-flow properties especially important, which is why 0W-20 is mandatory rather than a heavier grade.
Need these specs on your phone? Download OilFinderPro app for offline access and oil change reminders.
Last verified: 2026-06-06 | Source: 2023 Land Rover Defender Owner’s Manual (LRL 0771ENG)