I'm a little confused. Is this the vehicle?
2005 JEEP LIBERTY 2.8L 4-cyl Engine Code 5 TurboDiesel:
If so, these are Amsoil's recommended oils:
Engine Oil
Grade 1......CG-4
Synthetic 5W-40 Premium Diesel Oil
SAE 10W-40 Synthetic High Performance Motor Oil
Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil
All Temps......0W-40, 5W-40[1]
1. Must use synthetic engine oil.
The HDD would be an excellent choice for gas mileage, long oil changes (Personal Light Truck Diesel or
Gasoline Engine Service
• Normal Service(3) – Up to 25,000 miles or one year, whichever comes first, or longer based on oil analysis.
• Severe Service(4) – Up to 15,000 miles or one year, whichever comes first, or longer based on oil analysis.
• Replace AMSOIL Ea™ full flow oil filter at the time of oil change up to 25,000 miles (other brands at standard OEM* intervals).)
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I don't see where this Elf product meets any API classifications which are likely recommended by your owners manual. I don't see that it is recommended for extended oil changes. What is the price?