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No matter what the marketing claims are, there is significant evidence that even the best TC-W3® formulas are marginal, at best, for extreme temperature/output air-cooled two-cycle engine applications. This conclusion is supported by the major two-cycle additive companies. Industry studies indicate that the high temperatures encountered by air-cooled engines make them susceptible to premature failure when using oil designed for low temperature, water-cooled outboard engines. As a result of high temperature wear in air-cooled engines, increasing numbers of engine manufacturers are prohibiting the use of all TC-W® type oils. For example, Bombardier specifically prohibits the use of any NMMA TC-W, TC-WII OR TC-W3® outboard motor oils or other ashless 2 stroke-cycle oils in SEA-DOO® watercraft, Sea-Doo® JET BOATS and SKI-DOO® products. In addition, most chainsaw manufacturers worldwide specifically prohibit the use of TC-W® type outboard oils. These manufacturers demand oils that contain a low-ash, natural metallic detergent, delivering much higher temperature engine cleanup and cylinder scuffing protection. Something that TC-W3® ashless oils cannot provide. Thermally stable, deposit wear control metal-organic compounds are needed for these extreme conditions. In addition, replacing bright stock base oils with a specially balanced combination of polyisobutylene dramatically increases piston scuffing protection as-well-as reducing carbon deposits and exhaust smoke. For more infomation regarding polyisobutylene in two-cycle oil see BP Chemicals PIB Applications.