Viscosity classification guide
Fluids
Practical notes for choosing viscosity without mixing ISO VG, SAE, and lubricant grade systems.
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Lubricant Viscosity Selector
Recommends ISO VG based on ks/v factor and lubrication method; adjusted by speed and temperature.
Lubricant Viscosity Selector
Recommends ISO VG from ks/v and lubrication method. At high speed with jet/spray, lower VG may be selected; for high ks and low speed, higher VG may be needed.
Recommended ISO VGVG 100
Alternative rangeVG 68 - VG 150
ks/v factor2.08
MethodSplash
Speed v [m/s]12.00
Target oil T [°C]70.0
The ks/v approach is aligned with DIN/ISO-style lubrication selection logic. For high speed with spray/jet, one lower VG may be chosen; for splash/oil bath with high ks and low speed, one higher VG may be chosen. If temperature is above 85 °C, prefer one higher VG. Use your own detailed tables for final selection.
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