Highest-grade oils for standard automobile engine are pure mineral oils; viscosity at 50 deg. is not deciding factor, but viscosity up to 100 deg. cent.
Lubrication of motor vehicles. High-grade oils and their efficiency
Qualitaetsschmierung im Kraftwagenbetrieb -- Qualitaetsoele und ihre Leistungen
Automobiltechnische Zeitschrift ; 32 , n 1
1929
3 pages
Article (Journal)
German
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