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Synthetic 2-stroke oil is supposed to burn cleaner and decrease the incidence of carbon deposits around the spark plug electrode, while still lubricating more efficiently. But the main concern was about the smoke and carbon deposits.
Diesel fuel obviously had some changes, not just due to the lower amount of sulphur but also due to imrpovements at the modern injection systems and lower combustion temperatures at some of the most advanced engines to meet current emissions standards.
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