Join Date: Aug 2009
Location: Anderson, SC USA
My commentary about fuel economy vs. performance came from the Haynes manual. Nevertheless, I agree that the differences in fuel economy are negligible. 5W/30 has the widest temp range of all the recommended MK3 Jetta oil weights. In my case with a car with 250K+ miles on it, I found that skinnier oil reduces valve rattle on start up. However, I live in the sunny south - US, and Mcrow lives in Canada, so the winter temps are drastically different. Perrib, are you suggesting using a diesel filter on a gasser? Just curious.