• 75% more engine protection against horsepower loss and wear.
• 50% more cleaning power vs. AMSOIL OE Motor Oil
• Protects turbochargers 72% better than required by the GM dexos1 Gen 2 specification.
• Trusted by professional engine builders
• Guaranteed protection for up to 25,000 miles or 1 year

AMS Synthetic Motor Oil OW-40

Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world’s best motor oil. The result: engine protection that blows the doors off the highest industry standards.

FIGHTS ENGINE WEAR

• 75 percent more engine protection against horsepower loss and wear¹ than required by the industry standard, extending the life of vital components like pistons and cams.
• Develops a strong fluid film that keeps metal surfaces separated.
• Robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life.
• 
• AMSOIL Signature Series Synthetic
  Motor Oil provides reserve protection,
  allowing you to go longer between
  oil changes if you choose – up to
  25,000 miles (40,200 km), 700 hours
  of operation or one year, whichever
  comes first (see back page for details).
  Our unique synthetic formulation
  and long-drain additive system are
  inherently stable to resist oxidation and
  neutralize acids over longer periods.
  Signature Series is designed to
  deliver outstanding engine protection,
  cleanliness and performance over
  extended drain intervals – guaranteed.
  It provides peace of mind so you can fit
  oil changes into your schedule.