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Pre treat the stain spots with proper Fairy Liquid washing liquid - the stuff you use to wash dishes (not a generic brand). Just pour it on the affected area and pat in in before sticking in the washing machine as normal. It will work a treat and far better than any expensive stain treatments which might damage the clothing.
There is something in Fairy Liquid which dissolves all sorts of oil. When animals get covered in oil they use FL to help remove oil from fur by gently using it neat on the affected areas and then wiping clean. I know this because a few years back my cat was drenched in engine oil and the vet/me tried to clean him but it was so bad he had to be shaved.
Any suggestions for getting oily stains from clothes (shirts/t-shirts)? More oil from food rather than bike, etc.