Echo Powerblend® Gold 6450025 2.5 gal Oil Mix 8-6.4 oz 6 Pack Bottles per Case. ECHO PowerBlend® Gold is a semi-synthetic blend 2-stroke engine oil that mixes at a 50:1 ratio with 89 octane or higher gasoline. The oil formula includes detergents and a fuel stabilizer to maintain fuel quality, while the detergent assists in cleaner burning fuel and reliable performance. Both additives help to maintain a cleaner engine that helps to minimize exhaust-port blockages while protecting other vital engine components from wear and corrosion. A low smoke emissions formula offers improved environmental impacts on the user and surrounding environment.