WHY MAMMOTH TRUSTS THIS PRODUCT

The first 25 to 50 hours of a new or rebuilt engine are the most important miles it will ever fly. We recommend PHILLIPS 66® TYPE M because it’s a modern, multi-grade mineral oil that doesn't force you to choose between protection and performance during break-in. In the Pacific Northwest, a single-grade mineral oil can be sluggish on a cold morning start, leading to unnecessary wear. Type M provides the rapid circulation of a 20W-50 while maintaining the "high-friction" environment necessary to seat piston rings perfectly. It’s the Gold Standard for ensuring your investment hits its full TBO (Time Between Overhaul).