When dealing with oil stains, I will often use brackleen, but that will bleach the fabric. I am talking the old brackleen that has carbon-tetrachlorine in it, and not the environmentally friendly stuff which is alcohol based.
By the time you get the oil stain out, the canvas will be well washed out of it's colour. Personally, I would take the hour and sew new seat covers, or order a set from one of the dealers. New canvas always looks great.
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