if you happen to live in a densely populated country that is 95% mountain, that has no indigenous oil reserves, that has bitingly cold winters and everywhere you drive involves sitting in long traffic jams (so your engine oil can potentially take ages to get up to it's 100☌ operating temperature) then under such circumstances, I can imagine that an engine oil with a low KV40 (or more accurately, a lower aggregate KV during the start-up/warm-up phase) would give you a decent, measurable fuel economy credit. Unfortunately oil specs never contain limits on VI or KV40 so no-one generally is interested in this peculiar quirk of PMA. So PMAs automatically give you higher than usual Viscosity Index (VI). One of the peculiarities of PMA is that for a fixed KV100 and fixed CCS, it will always give you a lower KV40 (or KV '0 to 40' if you want to go even lower) than the equivalent oil made with bog standard OCP VII (regardless of SSI) or slightly more exotic Hydrogenated Styrene-Diene (Shellvis) VIIs. "The Japanese (and almost no-one else) like Poly-Methacrylate (PMA) VIIs in their engine oils. Na kraju ti ostaju samo testovi, gdje opet ne znas margine, al sta sad?
Imamo povrsno znanje, al kako drukcije i moze bit, kad se sastojci formulacija ne objavljuju javno. Isto tako ljudi vole vidjet Moly u uljima, jer su procitali o smanjenju trenja i AW karakteristikama, a ne znaju da skoro sva nova ulja sadrze GMO za smanjenje trenja i on se ne vidi na VOA. Ide se ka 0W zbog smanjenja potrosnje u gradovima. Velik VI moze jednostavno predstavljat fuel economy ulje. Ljudi gledaju, poput NOACK, i VI pa donose zakljucke o kvaliteti ulja po njemu, a zaborave da VI baznih ulja pokazuje kvalitetu baznih ulja, i taj VI nikad ne znas, dok VI konacne formulacije ukljucuje i VII koji imaju mana al su neophod.
INA Delta Sint 10w-40 (Benzin-Dizel) A3/B4ĪCEA iteracija 2021 je ubila A3/B3 sto znaci da nece bit novih A3/B3 formulacija, a stare ce se moc reklamirat jos koju godinu. Meni osobno nije bilo jasno zasto "bolja" verzija ima naveden nesto losiji Noack.
Ovo vjerojatno objasnjava dvije moderne verzije INA Delta Sint 10W-40 ulja, to pitanje se s vremena na vrijeme provlaci po forumu.
0 kommentar(er)
