I am very interested in using HM oil in my 12 years old (260,000KM) VW eurovan. It consumes about 1L of oil per 3000KM. I am in the middle of ARX application and after it is finished I like to try Castrol HM oil. All the short term reviews suggest that HM oils are good, however, I am not so sure of its long term effects! It seems HM oils have a ton of extra additives to stop leak, reduce friction and stop oil burning. I am affraid all these extra additive will have the same effect as popular oil additives such as STP etc. What do you guys think? Are HM oils a good choice for long term usage?