It’s rare to keep a car going past the 300,000 mile mark. In most cases, this involves proper maintenance and at least a few major repairs.

One man with a Toyota 4Runner that has 340,000 miles recently resorted to a little known old school mechanic trick to keep his ride running well.

In a TikTok with over 198,800 views as of this writing, HP Medina (@_hpmedina_) says the engine of his Toyota has gotten “crusty.” To clean it up, he puts diesel fuel into the oil

The passenger films the man pulling into a QuikTrip gas station. He asks what they’re doing there. Medina responds: “Oil change.”

Then he proceeds to pour diesel into his oil tank. You can see a layer of grimy buildup around the oil cap.