This slightly dated article from Edmunds has some info on use of biodiesel in cars and other vehicles. Scroll down to find the section Is biodiesel safe for cars

https://www.edmunds.com/fuel-economy/biodiesel-basics.html

On the original driving.ca link, it is interesting that right under the article it says "You may also like...) and then has links to three new diesel cars that will apparently soon be on market. A Jag, a Cruze and a Mazda. According to Edmunds, the Cruze can use B20, but the Mazda and most new diesels will need B5 . Intersting that some manufacturers are introducing new diesels while Mercedes are not.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5