Oils that are formulated specifically for extended drain intervals typically display elevated TBN to ensure proper corrosion protection for the duration of the extended interval.

Signature Series neutralizes acids

Because AMSOIL synthetic lubricants demonstrate consistently high TBNs, they neutralize acidic contaminants and keep them in suspension to prevent corrosion, maximizing engine protection. They use detergent and dispersant additives to significantly reduce sludge and carbon deposit formation.

In industry-standard testing, Signature Series Synthetic Motor Oil delivers 30% more acid neutralizing power than Mobil 1,^* and 36% more than Royal Purple,^*helping engines to stay cleaner, longer.

_{^EBased upon independent testing of Mobil 1 Annual Protection 5W-30, Royal Purple High Performance 5W-30, Schaeffer’s Supreme 9000 Full Synthetic 5W-30, Royal Purple High Performance 5W-30, Pennzoil 5W-30, Pennzoil Platinum Full Synthetic 5W-30, Valvoline Conventional Daily Protection 5W-30, Valvoline Full Synthetic Modern Engine 5W-30, Lucas Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased 05/03/18. ^*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, expressed or implied, is made by their use.}