Tried svo in my Merc 212 during summer, 5 cyl turbo version, 1996, roughly 50/50. Didn't like it one bit. Went into limp-home mode. Not funny!
You need to twin tank the 212D (start on diesel and change to veg at 60c) as it’s a direct injection engine. I’ve been running my 210D (basically the same engine) this way for around six years now.
100% veg once the engine is warm.