OIL & CARE the c‑tec2™ revolutionary clean‑burning engine technology demands an entirely unique oil formulation. this new lubrication system effectively delivers oil where it is required — as a result using significantly less oil compared with traditional 2‑cycle engines. this technology requires a new, unique viscosity and blend of additives and base stocks. after several years of intense testing, numerous formulations, thousands of dyno hours and hundreds of thousands of field test miles, we landed on this unique oil technology. the Only oil recommended for the c‑tec2 engine, but approved for all arctic cat 2‑cycle engines | reduction in recoil pull‑effort during cold weather starting | convenient c‑tec2 oil packaging provides easier pourability and less waste | fully synthetic formulation provides ultimate engine protection | detergent additives maximize arctic power valve™ and engine cleanliness | smokeless formulation burns extremely clean with a fresher scent 6639-520 48 oz. 6639-521 2.5 gallons APv™ syNTHETIC OIL Outstanding performance for all non‑c‑tec2 arctic cat 2‑cycle engines | protects against engine wear with excellent lubricity | provides excellent arctic power valve cleanliness | smokeless formulation burns clean | helps prevent piston scuffing, varnish formation and deposit buildup 4639-349 quart 5639-469 gallon 4639-347 2.5 gallons fORMULA 50 recommended for non‑arctic power valve 2‑cycle engines | performs well over a wide range of operating temperatures | minimizes engine wear | prevents rust/deposit formation 5639-475 quart 5639-476 gallon 5639-477 2.5 gallons 156