In Japan, Kendall GT-1 oil is extremely popular. One of the importers(www.engineoilya.com) claims that Kendall's paraffin base oil still comes from Bradford, PA and it is one of a very few oils that is approved by US Military(MIL-1-2104B46152???). And Kendall's patented technology called MFA(Multi Functional Additives)is so good that viscosity over the life of oil(1 year or 30,000km)never changes. 1qt bottle of the synthetic blend 5W20 and 5W30 sells for 2100 yen(about $19). However, Kendall website doesn't say anything about Military Spec, MFA, Bradford base oil or its longevity. If you guys know more about this American motor oil, let me know. And, if you can read Japanese, or at least interested, check out the above link to see how popular this oil is over here.