Motorno olje SAE 0W-30

SHELL Helix Ultra ECT C2/C3 0W-30

AP-L je na spodnjem koncu za 30 razred in to ni glih fajn poleti, ko ga teraš v klanec.

https://www.buygreatoil.com/oil-viscosi...

Kinematic viscosity / dynamic viscosity:

1. Kinematic viscosity is a fluid's resistance to flow and shear due to gravity. If a given lubricant's viscosity is lower, it will flow faster. For example, if you pour two containers, one filled with water, and the other with syrup, you would notice that the water flows faster due to its lower viscosity. Additionally, an oil's high-temperature viscosity grade is determined by its kinematic viscosity. This is where the "30" in 5W-"30".

2. Alternatively, there is dynamic viscosity, which is essentially the amount of energy required to move an object through the lubricant. Dynamic viscosity is measured using the Cold Crank Simulator test, and is used to determine an oil's low-temperature viscosity grade. This would be the "5W".


Additionally, you should understand what the numbers identifying different viscosities mean. For example, the "5W" in 5W-30 refers to the lubricant's ability to flow in cold temperatures. The lower this number is, the easier it will be able to flow in cold weather. Meanwhile, the "30" in 5W-30 indicates the fluid's ability to flow at a vehicle's normal operating temperature, which is 100°C. If this number is higher it means that the oil will remain thicker at operating temperature. So, in the above example of 5W-30 vs 0W-30, both would operate the same at operating temperature while the latter would flow better in cold weather.

Garancija, tak da samo zgoraj omenjeno.

Stvar je enostavna.

Hitreje vrtiš, nižjo viskoznost si želiš.

Počasneje vrtiš višjo viskoznost si želiš.

Načeloma pa olje ne sme odstopati od normativov proizvajalca. Gledaš številko specifikacije. Gradacija ... odvisna predvsem od tega kje po svetu se avto vozi.

Standard je ok, če voziš normalno, professional pa če ga voziš v prestavi nižje.

Višja viskoznost pomeni več izgub vendar hkrati tako mazivo prej ustvari oljni klin saj ga ležaj zaradi strižnega odpora lažje črpa.

m0LN4r je 29. jan 2021 ob 23:20 izjavil:

Saj tista slika zgoraj je iz navodil.

V navodilih na strani 8, da: "priporocamo uporabo ECT C2/C3 0W-30" zaradi ucinkovitosti in optimalne porabe, potem pa zvezdica in pri zvezdici pise, glejte tabelo na strani 9 za izbiro pravilnega olja glede na zunanjo temperaturo okolja kjer se avto uporablja. The fuck?

Moj avto -10 ne vidi nikoli, torej vse kar je pod tistim 20W-50 v tabeli potem odpade.

Gre se zato, da mora mazivo opravljati svojo funkcijo tudi pri nizkih temoeraturah. Ne sme kristalizirat mora pa tudi indeks viskoznosti zadostiti za cel režim ogrevanja od skrajnega minusa do delovne temperature cca 100 stopinj celzija.

Evoga zdaj pa bodimo pametni. Glede na to, da se mi za ekonomijo/porabo boljkone jebe bi jaz osebno izbral HX7 ECT 5W-40.

Zdaj verjetno imajo ostali proizvajalci plusminus iste vrednosti glede na klasifikacijo, drugace klasifikacije nimajo smisla.

Shell Helix Ultra Professional AP-L ustreza nekterim specifikacijam zahtevane s strani PSA ter Fiata (to je zdaj itak ista firma... )
Shell Helix Ultra ECT C3 ustreza nekterim specifikacijam zahtevane s strani BMW-ja, Mercedesa, General motors-a ter Chrysler-a.

Tudi to je važen del...