No matter how you slice it (or trim it or shred it), there's no better protection for your high-performance two stroke engine than Stihl hp ultra Oil. This two cycle engine oil has outstanding engine cleaning characteristics, plus "Ultra" lubricating qualities that are great to other two 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.