XLO Ultimate Syn Blend w /Moly 15w40 Case 12x1Qt

The XLO Ultimate Syn Blend w/Moly 15W40 Case of 12x1Qt quarts is purpose-built for mechanics and automotive enthusiasts who demand reliable engine protection across demanding operating conditions. This synthetic blend formulation bridges conventional and fully synthetic performance, making it ideal for vintage restorations, heavy-duty applications, and vehicles operating in variable temperature climates. Whether you're rebuilding a classic engine, maintaining fleet vehicles, or running modified powerplants that generate sustained heat, this case quantity ensures you have sufficient inventory for multiple oil changes or shop stock without compromise on protection.

AMALIE's 15W40 viscosity grade delivers optimal flow at cold startup while maintaining robust film strength at operating temperature—critical for older engine tolerances and modified builds where bearing clearances may vary from factory spec. The integrated moly (molybdenum disulfide) additive package reduces boundary friction during acceleration and high-load events, protecting valve trains, pistons, and crankshaft journals under extreme conditions. The synthetic blend base stock resists thermal breakdown better than mineral oils, extending drain intervals and preserving viscosity stability even in turbocharged or supercharged applications where conventional oils struggle to maintain shear resistance.

This bulk case format (12 quarts) is engineered for serious mechanics, restoration shops, and DIY builders who perform frequent maintenance or maintain multiple vehicles in their shop. The 15W40 rating suits naturally aspirated and moderately boosted engines across vintage and contemporary platforms, offering superior compatibility with older engine seals and gaskets compared to lighter grades. Confirm your specific vehicle's factory oil specification before use, as some modern engines designed for thinner viscosities may require different grades for optimal fuel economy and warranty compliance.