I've been running WalMart's SuperTech full synthetic oil and the AC Delco PF-46 oil filter in my Canyon since its first oil change at around 2,100 miles. I now have nearly 13k miles on it and it's been through a total of two oil changes.
I sent samples of the oil from my oil change at 12,765 miles and the one before that at 7,160 miles. out for analysis. I put 5,026 miles on the first change with SuperTech and 5,605 on the next oil change. Both samples were sent to Blackstone Labs ( http://www.blackstone-labs.com
) in Fort Wayne, IN. And you know what? This is actually pretty good stuff! When you factor in the price of $14 for a five quart jug of SuperTech full synthetic versus a five quart jug of Mobil1 for roughly $25 it's a big savings.
I'll post the actual reports if I can find a way to hide my personal information because they include the values for things like the amount of aluminum, lead, molybdenum, etc that is found in the oil sample as well as fuel, antifreeze and twenty some other items. Here's what Blackstone had to say about the oil from the oil that was changed at 7,160 miles back in November 2007:
The higher copper and silicon are not unusual finds in the oil from your new 2007 Canyon. The copper is
high due to break-in of new brass/bronze parts, while silicon is from sealers. We expect your engine will look better in
two or three more oil changes. The higher copper level is typical of new GM engines and it takes awhile to drop below
iron. The TBN was 2.4, indicating lots of active additive left in the oil. 1.0 is considered too low. The viscosity was a
little low, but isn't a concern since it wasn't due to fuel dilution. No anti-freeze found.
And here's what they had to say about the oil changed at 12,765 miles at the beginning of April 2008:
Nice improvement in copper and silicon. Aluminum and iron increased, and that's a little unusual for an
engine so new, but both metals are still reading well within the average range, so we do not think they are from a
developing problem. The viscosity was still low and again, it wasn't due to any fuel, so it's not a major issue.
Insolubles were fine at 0.2%, showing good oil filtration. The TBN read 1.8, which means there was still some active
additive left in the oil, but not a whole lot. A value of 1.0 is considered low. Overall, a good report. Try 6,000 miles
So basically they are suggesting that I go for 6k miles on this recent oil change before changing it again. I'm going to do that and send along another sample just for grins.
SuperTech may not as good an oil as a name brand like Mobil1. However, it looks to be pretty decent even with the viscosity issue noted above. And it's still probably better than a dino oil. I've used full synthetics for many years and I've never seen any sludge or grime buildup under the oil fill cap. My wife's 2002 Passat, however, with 120k miles and oil changes with dino-oil only does have a bunch of crap built up and is nowhere near as clean as my past synthetic only vehicles.
So there you have it, real life test results of SuperTech.