dont use any liquid or wet material on dry bearings or open bearings, it attracts dirt, wd-40 is the wort thing you can ever use on moving parts.
garage door lube is really good, sprays on wet and drys leaving only a thin amount of silicon or graphite depending on the product and will not attract dirt. Granted that bearing is clean after 200K miles i am assuming so its probably no big deal but just my 2 cents worth of useless advice.