Petro-Canada Lubricants' Gas Engine Oil Long Drain (GEO LD) 15W-40 gear oil comes formulated for the high combustion temperatures in natural gas mobile engines. It also allows users to extend drain intervals up to 1200 hours, while maintaining exceptional engine protection and stay-in-grade capability. It comes composed of 99.9 per cent pure base oil and pumps quickly and easily through the engine, safeguarding engines against wear and tear.