I was using mobil 1 ep 10W 30 and was adding 1 grt. about every 1600 miles(8000oci). I switched to mobil clean 5000 10w 30 and was adding 1 qrt. about every 1600 miles( 5000 oci). Now I have T/A syn blend 10w 30 and I have only added 16 oz. in 1600 miles currently about 2200 miles into 5000 mile oci. This car is a 98 mazda 626 2.0 with 205000 miles on it and runs great.I do not want to come off as a mobil basher, just thought I would share this info. I still use mobil in my 92 GMC safari with 198000 miles on it and thats all I've ever put in it,(ooops)Except for the occasional exxon supperflo.(with no top off on the oci).