I was searching on amazon see the havoline pro ds full syn oil then i read it say 100% Base stocks oil so i go to havoline website it also say 100% synthetic base stock if i recall correctly it means group 4 and group 5 ( poa or ester base oil ) as read by here and amsoil and machinary lubrication . but there nothing i can see as it . I think about share it here and see what other say. Check link below then go to feature see 100% synthetic base stocks on the website. Did this give information that it only poa and ester base oil or it just marketing claims. http://www.havoline.com/en-US/products/motor-oils/synthetic.html
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