MAMMOTH PETROLEUM
778-370-3330
WHY MAMMOTH TRUSTS THIS PRODUCT
In the Pacific Northwest, our flying weather changes by the minute. We recommend PHILLIPS 66® X/C® 20W-50 because it’s the ultimate "do-it-all" workhorse for year-round reliability. Before X/C, pilots had to swap between thin winter oils and thick summer grades. This is the Gold Standard that changed everything—offering the rapid cold-start flow of a 20W in the morning and the rock-solid protection of a 50-grade in the heat of the afternoon. We trust it because it has more flight hours behind it than almost any other multi-grade oil on the market, ensuring your engine hits its TBO with internal components that look factory-new.
PRODUCT RESOURCES
ENGINE PERFORMANCE
Advanced multi-viscosity formula provides instant lubrication to the top end during cold starts while maintaining extreme film strength at high operating temperatures.
WEAR
PROTECTION
Premium Ashless Dispersant (AD) chemistry keeps lead salts, soot, and combustion by-products in suspension, preventing the sludge and varnish that kills engine efficiency.
Superior solvency and thermal stability reduce oil consumption and keep piston rings free, maximizing your time in the air and minimizing your time in the shop.
OPERATIONAL UPTIME
TECHNICAL DATA
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APPLICATIONS & OPERATIONAL GUIDELINES
YEAR-ROUND VERSATILITY: The premier choice for opposed piston engines in all weather conditions. It effectively replaces single-grade 65, 80, or 100 oils without sacrificing protection.
BREAK-IN & BEYOND: While many use Type M for the first few hours, X/C® is FAA-approved for use from the very first break-in hour all the way to TBO.
CLEANER INTERNALS: High-solvency base oils ensure that contaminants stay in the oil and out of your engine, draining away cleanly at every 50-hour service.
OPPOSED PISTON SPECIALIST: Specifically engineered for Lycoming, Continental, and Pratt & Whitney opposed-piston engines.
CERTIFICATIONS: FAA approved. Meets Avco Lycoming 301G, Pratt & Whitney Service Bulletin 1183, SAE J1899, and Teledyne Continental MHS-24B.