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I have the same opinion like other guys. Why paid for a group III oil when you have a better oil for the same price?? I never see nothing about Castrol Syntec are made for extended drain.

WOW!!! Very good results!! Do you try an other 5000 miles like Blackstone Labs suggest??

I not said that this oil is not good!! I think is a very good oil for the price, I used since 1 year and i'm very happy. But, I don't understand the decision of amsoil. Why he don't make an other product with this specific like motul?? I think is for money reason but...

ok, thanks. I'm fixed. I thinks AMSOIL XL are a good choice for the price, I use since one year and i'm satisfied. But I have an other question, Castrol Syntec are group III. But what is the difference in the composition of this oil because the quality are very different.

I would like to be fixed about them. Many of peoples said AMSOIL XL serie are Group III based oil. But I send an email directly to AMSOIL and he said to me that XL serie are Full synthetic oil. This is a real synthetic or not??

Hi! I don't now if you have compare the new properties of the new AMSOIL AFL 5W40 via the old. But I think the quality drop... Old : Vis. @ 100deg.: 14.5 Vis. @ 40deg : 83.6 Viscosity index : 182 Viscosity CCS : 5241 (-30) Flash point : 232 (449) Fire point : 246 (474) Pour point : -51 (-59)...

this is the answer I receive from Valvoline about SynPower Question : Hi! I read FAQ about SynPower oil, to find what base Valvoline use. I find this answer : Is SynPower a full synthetic? Is SynPower motor oil PAO or ester based? Does it require a special filter? Yes, SynPower is 100%...

I have a VW Jetta TDI 98 and a Golf GL 96 with 2L. These two cars runs with AMSOIL AFL 5W40 and i'm very satisfied. It's not a problem to runs 5W30 on the 2L engine, but why don't use Euro Formula for an Euro Car