Three Tiers of AMSOIL Quality. Choose your oil drain interval.The Signature Series is for those who want the absolute best engine protection, performance and maximum value through extended drain intervals.
The XL Series is for those who want extra engine protection and performance and the convenience of twice-per-year oil changes.The OE Series is for those who want excellent engine protection and performance for vehicle manufacturer-recommended oil change intervals.
Will extending oil change intervals void new vehicle warranties?
Answer: No. Extending oil change intervals will not void new vehicle warranties. To affect the vehicle warranty, it must be determined that the lubricant was directly responsible for the failure; if the oil didn’t cause the problem, the warranty cannot be voided, regardless of brand or length of time in use.