Maxima 2-Stroke Premix Racing Oil Castor 927 — 64 oz, ester-blend for high-rpm protection

Maxima 23964 Castor 927 is a castor- and ester-blend 2-stroke premix racing oil formulated to protect high-revving engines while supporting peak power delivery.

Built for aggressive racing and high-stress conditions, this 64 oz premix oil combines refined castor oil with surface-active esters and an ash-free additive package to limit carbon, gum and deposit buildup. The formulation emphasizes film strength, tenacity on metal surfaces and resistance to vaporization so internal components—cylinder walls, bearings and journals—retain lubrication and protection when temperatures and rpm climb. Below are focused answers to common buyer questions to help you decide if Castor 927 suits your machine and riding style.

How does this oil protect two-stroke engines under racing conditions?

Castor 927 uses a highly-refined castor base fortified with exotic esters and a surface-active chemistry that adheres to metal surfaces. This creates a resilient lubricating film that reduces wear and prevents dry spots at high rpm, while the ash-free additives minimize deposit formation that can hurt performance.

• Thick, tenacious film for cylinder walls and journals
• Surface-active esters that bond to metal and resist wash-off
• Ash-free package lowers carbon and gum accumulation
• Designed to withstand vaporization at high temperatures

Will this oil help maintain power output and throttle response?

The ester-enhanced castor base is engineered to preserve oil film at extreme loads, which helps maintain consistent compression and smooth ring sealing—key factors for steady power delivery. Because the oil resists carbonization and deposits, intake and exhaust ports stay cleaner, supporting predictable throttle response over race runs.

• Combines castor strength with esters for peak mechanical protection
• Reduces deposit buildup that can choke ports and exhaust
• Supports stable compression through better ring sealing

How should I use this premix oil and what mixing ratio is recommended?

Maxima Castor 927 is supplied as a 2-stroke premix oil meant to be blended with gasoline before fueling. Follow your engine manufacturer's recommended fuel-to-oil ratio or your established racing tune; many riders select leaner or richer ratios based on track conditions and engine break-in requirements.

• Mix thoroughly into fuel before filling the tank
• Adhere to OEM or race-team recommended ratios for best results
• Adjust ratio only with performance needs and temperature in mind

Does this oil require special storage or handling?

Store the 64 oz bottle in a cool, dry place away from direct sunlight and open flames; keep the cap tightly closed to prevent contamination. As with any racing oil, avoid prolonged exposure to extreme heat and keep out of reach of children and pets.

• Seal bottle after each use to maintain formulation integrity
• Store at stable room temperature away from ignition sources
• Dispose of used or excess oil according to local regulations

Who is this for: Maxima 23964 Castor 927 targets competitive riders, vintage and modern two-stroke enthusiasts, and anyone needing a high-tenacity premix oil for hard-running applications. If you race motocross, road course, enduro or restore high-performance 2-stroke machinery and prioritize film strength, deposit control and proven protection under stress, this 64 oz ester-fortified castor oil is formulated to meet those needs.