Dumb question, but here goes. This is causing a dilema for me. Been reading this board for a couple months and find it tremendously interesting. I have used Castrol GTX for over 20 years and have always gotten excellent service from my vehicles. I change oil "a lot". Oddly enough I started using Castrol in the late 1970's when a Honda dealer told me they had had several cars significantly decrease oil consumption when the owners switched from Pennzoil to Castrol (course that is historical now). Even though I have gotten what I consider good results from Castrol GTX, I am considering a change back to Pennzoil 10W30 since, after reading this board, Pennzoil is Group II+ and Castrol GTX is Group II and some seem to have other issues with Castrol GTX. I would definitely also consider Chevron, but it is not readily available in this area in 10W30. I can read the data sheets, but do they really tell the whole story? I would appreciate any thoughts on this potential change. I use Castrol GTX 10W30 in a 99 Honda Accord 4cyl(48K), a 92 Camry 4cyl (126K).