actually it's 2 new cars . A 2010 ( 6,500 + miles ) and 2008 TOYOTA Yaris with 21,000 + miles . Looks like it's coming from the upper back seal of the timing chain cover . Started using 5w-30 syns in both at around 1,200 miles . Have looked at a few other YARIS and no leaks . They are a 2007 3 door with 18,000 + miles and a 2010 3 door that belongs to someone we know at 30,000 miles . Both were dry as a bone . Both are using conventional motor oil .