i ran the walmart syn in my vw for one oil change since it was too cheap to pass up - seemed to run well - i have two spare quarts in the garage to top off both heeps every now and then
some stuff i found online:
"I've been running 5w30 super tech in my 2000 nissan xterra with 120000 mostly city miles and 2004 nissan sentra with 150000 mostly highway miles and couldn't be happier. I change my oil every 5000 miles and also use the super tech oil filter and niether vehicle uses any oil between changes and both run great. They told me here in Tennessee that super tech oil is made by penzoil. I also use the other super tech products such as coolant, power steering fluid, ect. when needed."
"I was told by Tech Support at Royal Dutch Shell Corporation, (the makers of Quaker State, Pennzoil, and Rotella engine lubricants) that the Walmart brand of full synthetic oil (that is bottled by Warren Packaging Co. for Walmart), is supplied to Warren by Royal Dutch Shell, and is virtually "identical" to Pennzoil Platinum.
I have used Pennzoil Platimum with excellent results. Shell has always made excellent lubricants, ask any truckers or heavy equipment operators who use Rotella, they consider it the "standard".
Also... In my part of the country most of the other versions of Walmart regular engine oil is supplied to Warren by Exx"
Walmarts Super Tech oil is awesome. I have used ST 10w-30 from day 1 on a new 2000 Isuzu Rodeo 4x4. I currently have 60000 miles on this. Mostly city driving, light 4 wheeling in the snow and light trailer towing. I change my oil every 4 months (3 times a year) reguardless of milage. I decided to do 2 oil analysis via Blackstone Labs. I sent 1 oil sample during the winter months and 1 from the summer months. All my readings came back excellent, and it was recommended to extend my oil drain intervals.