Motul 5W40 Oil Change Kit EJ WRX/STI vs Motul Master Oil Change Kit 5W-30 for Subaru EJ

Both kits are the same idea: five liters of Motul full synthetic, a genuine Subaru OEM filter and a crush washer. The real choice is oil grade. The 5W40 X-cess kit suits built EJ motors, high boost and hard track use, where a thicker, higher-HTHS oil holds film strength at temperature. The 5W30 X-clean kit is the closer match to stock EJ20/EJ25 maintenance, with a low-ash C2/C3 formulation aimed at cleaner running and steady oil pressure. Owners of stock or lightly modified WRX and STI cars are usually better served by the 5W30 kit; big-turbo and built-motor cars by the 5W40.

• Choose the Motul 5W40 X-cess kit if your EJ is built, runs high boost or sees track time and you want more viscosity at high oil temperatures.
• Choose the Motul 5W30 X-clean kit if your EJ20 or EJ25 is stock or lightly modified and you want an oil matched to normal street maintenance.