No matter how you slice it (or trim it or shred it), there's no better protection for your high-performance 2-stroke engine than Stihl HP Ultra Oil. This 2-cycle engine oil has outstanding engine cleaning characteristics, plus "Ultra" lubricating qualities that are superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable, degrading by 80% in 21 days. We're so confident this oil will protect your engine, we'll double your Stihl limited warranty when you use it. It's that good.