I'm considering using Pennzoil Ultra in 5W-20 for one of my cars, and 5w30 for the other one. Question is how much better is the Ultra then Platinum or Pennzoil conventional. I plan to go 12 months oci. I generally drive each vehicle about 4000 miles per year. I do drive long enough trips to warm oil to operating temp. I'm not worried about condenstion causing oil to become acidic. It's usually very dry in West Texas.
Thanks
Thanks