I'd say that Wally's oil doesn't have the better quality additive package of other top syn's. Hence, it would only be good for a moderate oci, before oxidation became a problem. I doubt it's really a bargain if you could get the same results from Pennzoil @ a cheaper price with a 5K oci. I've seen some of the uoa's and the USA version doesn't appear to have much Moly, no Boron, and not enough ZDDP. I'd rather get PZ dino or Syntec Blend and save some cash or go for the Mobil 1 if a real synthetic is needed.