Engine oil Jeep Wrangler JK EZH (3.8i) — viscosity and approvals

Which engine oil for Jeep Wrangler JK EZH (3.8i, 2007–2011) — viscosity, specifications, capacity and change interval.

Engine Specifications

Recommended Oil

Change oil when either condition is reached — mileage OR time. Never exceed both limits simultaneously.

Approved Oil Brands

Mopar 5W-20 / Castrol GTX 5W-20 / Mobil Super 5W-20

How to Choose Oil for EZH

1. Viscosity must match specification — using the wrong viscosity grade is not acceptable. Only 5W-20 is approved for EZH.
2. Check the approval code on the label — the can must show API SN / Chrysler MS-6395 compliance. Regular oil with an incorrect approval may damage the engine.
3. Volume — when changing with a new filter, you need 5.7 L. Check the oil level with the dipstick 5 minutes after filling.
4. Do not mix grades — if topping up, use the same viscosity and specification.

Consequences of Using the Wrong Oil

• Oil with a wrong approval for a petrol engine can clog the DPF filter (diesel) or cause excessive oil consumption.
• Too thin oil (e.g. 10W-40 instead of 5W-20) accelerates timing chain/belt and crankshaft bearing wear.
• Too thick oil makes cold starting difficult and increases fuel consumption.

Domande frequenti

What oil goes in a Jeep Wrangler JK EZH?

Viscosity 5W-20, approval API SN / Chrysler MS-6395, volume 5.7 L. Recommended brands: Mopar 5W-20 / Castrol GTX 5W-20 / Mobil Super 5W-20.

How often to change the oil in Jeep Wrangler JK?

Every 8 000 km or 6 months — whichever comes first. With heavy city driving or short trips, every 7,500–10,000 km.

How much oil does the EZH take?

5.7 litres with a new filter. Before ordering, double-check — some Wrangler JK variants with the same engine code may differ by 0.2–0.5 L.