Lubricants

Truck lubricants are specialized oils and fluids designed to reduce friction and wear in heavy-duty diesel engines, transmissions, and differentials. Using the correct truck lubricants, including diesel engine oil for trucks and semi truck transmission oil, helps prevent breakdowns, extend component life, and maintain fuel efficiency. For semi trucks running long hauls, high-quality lubricants are essential to protect critical parts under extreme loads and temperatures.

The best oil for semi trucks typically meets or exceeds OEM specifications, heavy-duty diesel standards (such as API CK-4), and is available in popular viscosities like 15W40. Many fleets prefer synthetic or synthetic-blend diesel engine oil for trucks because it offers better protection at high temperatures, longer drain intervals, and improved performance under heavy loads. At Milian Truck Center, we stock top brands and grades so you can choose the best oil for semi trucks based on your engine type and operating conditions.

Change intervals for truck lubricants depend on your truck manufacturer’s recommendations, the type of oil for semi truck you use, and how the truck is operated. Many fleets change diesel engine oil for trucks every 15,000–25,000 miles, while semi truck transmission oil and transmission fluid for semi truck are often serviced at longer intervals, such as 100,000 miles or more. Always follow your owner’s manual and consult with a heavy-duty service center like Milian Truck Center to set intervals that match your routes, loads, and climate.