4T MOTORRADÖL - 01 RS 15W50

15W50 is designed for large-displacement, air-cooled motorcycles where the engine generates significant heat and runs at relatively low RPM under load — typically 350cc to 650cc engines. In the Indian market, this grade is specifically suited for Royal Enfield Classic 350, Meteor 350, Bullet 350, Super Meteor 650, and Interceptor 650. These engines run at lower RPM ranges than sports bikes but generate high oil temperatures due to the air-cooled design and larger combustion chambers.

Royal Enfield's single and twin-cylinder air-cooled engines have wider piston-to-cylinder clearances compared to modern liquid-cooled engines. They also run hotter, especially in slow city traffic. A thinner oil (10W30 or 10W40) can lose sufficient film strength at high temperatures in these engines, leading to metal-to-metal contact. Royal Enfield India recommends 15W50 for most of their models, and the 01 RS 15W50 API SP meets and exceeds that specification.

For the **J-Series 350** engines (Classic 350 Reborn, Meteor 350, Hunter 350, Bullet 350 Reborn): 15W50 is the correct OEM-recommended grade. Capacity: 1.7 litres per full change. For the **650 twins** (Interceptor 650, Continental GT 650, Super Meteor 650): Royal Enfield's primary recommendation is **10W50 fully synthetic** (capacity: 3.1 litres refill / 3.9 litres dry fill). The 01 RS 15W50 is an acceptable alternative used by many 650 owners, but 10W50 is the OEM primary grade. If a 10W50 product is available in the Carbo Oil range, prefer it for the 650 twins. For the **older UCE 350** models (pre-2022 Classic/Thunderbird/Bullet UCE): 15W50 JASO MA2 is appropriate, capacity 2.5 litres.

Royal Enfield recommends oil changes every 5,000 km or 6 months. Oil quantity per full change: - **J-Series 350 (Classic Reborn, Meteor 350, Hunter 350)**: 1.7 litres - **UCE 350 (older Classic/Thunderbird/Bullet)**: 2.5 litres - **650 Twins**: 3.1 litres (refill) / 3.9 litres (dry fill after engine rebuild) With the 01 RS fully synthetic grade, 350cc models can extend to 6,000–7,000 km. Always check the dipstick every 1,500–2,000 km — Royal Enfield engines are known to consume small amounts of oil between services.