So the question is should i run castrol gtx high mile or penz high mile? My driving habbits are about a 25 mile trip to work everyday just about. 20 miles of it is 65 mph highway and the other 5 is stop and go city. Its a 01 suzuki esteem with 145k miles. Makes a little puff on start up (valve stems). So about 50 miles a day. Anyways what oil is better for me and why? I get it changed at walmart for 34.99 for hm oil and those are there only two choices of oil. Also it uses about half a quart or less every 3k change.