BG 109 Compression Performance Restoration is a revolutionary formula with proven “ring-clean” technology. It is a quick and effective blend of cleaners that will soften, emulsify and dissolve those hard to remove fuel gums that clog rings and will usually do it in 15 minutes or less. Compression will increase with removal of these deposits. BG 109 also lowers tailpipe emissions, eliminates oil consumption associated with buildup and improves overall power and economy. Safe for use in diesel and rotary engines.