Mobil 10W-40 Racing 4T Motorcycle Oil — 1 Quart Pack of 6, Clutch & Transmission Protection for Sport Bikes

Mobil 1 98JA11 10W-40 Racing 4T is a conventional motorcycle oil formulated to protect high-revving four-stroke sport and racing bikes while preserving clutch and transmission performance.

This Mobil 1 Racing 4T 10W-40 comes in one-quart bottles sold as a pack of six and is designed for on-road, off-road and competitive four-stroke motorcycles. It balances cold-start flow with stable operating viscosity and includes additives tailored for motorcycle engines where engine, gearbox and wet clutch protection must work together. Read on to see how this oil fits into your maintenance routine, what riding situations it supports, and which bikes it's best suited for.

How does this oil perform during high-temperature racing or long rides?

Mobil engineered the Racing 4T formulation to resist viscosity breakdown under sustained heat and heavy load, helping maintain a stable oil film during extended high-rpm use. That stability supports engine durability and consistent power delivery when temperatures climb in track or endurance situations.

• SAE 10W-40 viscosity for reliable hot-operating protection.
• Formulation optimized to resist shear and thinning at high temperatures.
• Designed to help keep combustion chambers and deposits under control during intense use.

Will this oil protect my clutch and transmission in a wet-clutch motorcycle?

Yes — the Racing 4T is tailored with friction characteristics appropriate for motorcycles with integrated engines and gearboxes that share the same lubricant. It aims to provide consistent clutch feel while protecting transmission gears from wear.

• Balanced friction properties to minimize clutch slippage while enabling smooth engagement.
• Contains gear protection additives to reduce wear on transmission components.
• Formulated for combined engine/transmission lubrication common in sport bikes.

Is this oil suitable for both street and off-road riding?

The Racing 4T is intended for versatile use across on-road, off-road and competitive environments. Its formulation supports varied duty cycles, from stop-and-go street riding to the sustained loads of off-road or track conditions.

• Adaptable performance for mixed riding styles and varied ambient temperatures.
• Helps maintain engine cleanliness to support power output across conditions.
• Check your motorcycle owner’s manual to confirm recommended oil weight and approvals.

How do I know if SAE 10W-40 conventional oil is right for my bike?

SAE 10W-40 indicates how the oil behaves at cold start (10W) and at normal operating temperatures (40). Many sport and midweight motorcycles specify 10W-40 for balanced performance, but always match the oil weight and type to your manufacturer’s recommendations to protect warranty and performance.

• 10W cold rating for improved cold-start circulation compared with thicker oils.
• 40 hot rating to preserve film strength and protect bearings and cams at operating temperature.
• Conventional base stock—suitable where manufacturers permit non-synthetic oils.

Who is this for: Mobil 1 98JA11 10W-40 Racing 4T is aimed at sport-bike riders, club racers and adventure riders who need a robust conventional oil that supports high-revving engines, wet clutches and gearboxes. Choose this pack-of-six if you perform regular oil changes, ride in mixed conditions, or prefer stocking multiple quarts for frequent maintenance. If your motorcycle manufacturer specifies synthetic-only formulas, or if you require oils with specific API/ACEA approvals beyond conventional classifications, verify compatibility before switching.

• For best results, always follow the oil change interval and specifications listed in your motorcycle owner's manual.