A recent Valvoline press release claims their new heavy-duty diesel oil is capable of extending drain intervals up to 100,000 miles "in select engines under certain operating conditions."

According to Director of Commercial Brands and technical Services Bill Runkle, the interval was achieved by a 5W-40 viscosity oil during long-haul, coast-to-coast trips in Caterpillar C-15 and Cummins ISX engines. However, the oil was developed specifically for use with exhaust gas recirculation (EGR) unit, and officials for Valvoline acknowledge the new oil "won't deliver intervals even close to 100,000 miles in EGR-equipped engines."

With the use of oil analysis and the AMSOIL Dual-Gard filtration system, AMSOIL Synthetic Diesel Oils have been proven to extend drain intervals well over 100,000 miles in heavy duty diesel engines.

The special performance additives of AMSOIL Diesel Oils, along with the ultra-fine filtration provided by the AMSOIL Dual-Gard filtration system, have helped effectively control increased levels of acid and soot associated with EGR systems.