TSI Supercool E31 Ester Compressor Oil 32 oz — Dye-Free, PAG/Mineral Compatible

TSI Supercool E31 Ester Oil 32oz is a dye-free synthetic ester compressor lubricant designed to protect refrigeration and automotive A/C compressors while remaining compatible with PAG and mineral oils.

Engineered for service technicians and advanced DIYers, this 32 oz bottle of E31 provides high lubricity and protective additives for compressors running on commonly used refrigerants. It includes corrosion inhibitors, O-ring conditioner, anti-wear, and antioxidant components to support moving parts and help minimize acid formation. The formula is free of dye, which is useful when you need to preserve system cleanliness or avoid interference with leak-detection dye protocols.

How does this oil protect my compressor?

E31’s synthetic ester base delivers strong film strength and lubricity to reduce metal-to-metal wear under high loads and temperatures. Anti-wear and antioxidant additives extend component life by limiting friction and slowing oxidative breakdown.

• High lubricity synthetic ester reduces bearing and vane wear
• Anti-wear package for longer service intervals
• Antioxidants slow fluid degradation in operating conditions
• Corrosion inhibitors help protect internal surfaces

Which refrigerants and oils is E31 compatible with?

This lubricant is formulated to work with R-134a and legacy R-12 refrigerants, and it blends compatibly with both PAG and mineral oils for flexible use during repairs and retrofits. It is not formulated for HVAC systems or R-1234yf applications.

• Compatible with R-134a and R-12 systems
• Mixes with PAG and mineral oils when service requires top-off
• Not for HVAC residential/commercial equipment or R-1234yf
• Dye-free for clean diagnostics and service work

Can I use it during an A/C system service or retrofit?

E31 is suitable for many automotive A/C service jobs and component replacements where ester oil is specified or acceptable. Because it contains an O-ring conditioner, it helps preserve seal elasticity during service and reduces the risk of leaks after reassembly.

• Useful when replacing compressors or performing oil top-offs
• O-ring conditioner aids seal compatibility and longevity
• Dye-free formula avoids masking pressure-tested leaks
• Follow manufacturer recommendations for oil type and quantity

What precautions should I take before using E31?

Always confirm the compressor manufacturer’s lubricant requirements and do not use E31 in systems specified for other oil types like POE for certain refrigerants or R-1234yf service. Avoid HVAC systems and ensure proper oil evacuation and recycling to prevent cross-contamination.

• Verify compressor and refrigerant compatibility before use
• Do not use in HVAC or R-1234yf systems
• Drain and recover old oil to prevent contamination when topping off
• Dispose of used oil per local environmental regulations

Who is this for? TSI Supercool E31 Ester Oil 32oz is aimed at automotive technicians, mobile A/C specialists, and knowledgeable DIYers who need a dye-free ester lubricant for R-134a or R-12 service. Choose this product when you require a high-lubricity synthetic ester that conditions seals, protects compressors from wear and corrosion, and can be blended with PAG or mineral oils during repairs. If you’re servicing building HVAC equipment or working with R-1234yf systems, select a product formulated for those applications instead.