If nothing else works, Kerosene it. Scrub kerosene generously into the spot. Go outside, put the garment in a large bucket with hot water and automatic dishwasher detergent (the harsh gritty stuff) and plunge with a plunger. You should see the spot dissolve and disappear. Let it cool, squeeze the liquid out, and launder by itself in hot water and dry on a clothesline. (Don't put it in the dryer unless you cannot smell the kerosene any more.)
There is a product called "Zout" on the laundry aisle. I have used it on clothes that were washed and dried with oil on them and the oil came out. Almost every shirt I owned had grease or oil on it due to cooking, and now none have it anymore. I'm not sure about truck grease, but I know it worked wonders for me. Hope it works for you! God bless!
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