what is the viscosity of mineral oil in the same terminology as car motor oil

Ai overview answer per Google

Common light mineral oil (like baby oil) has a kinematic viscosity roughly equivalent to an SAE 10 or 15 single-grade (monograde) oil, measuring about 15 to 20 cSt (centistokes) at 40°C. [1, 2, 3]
Viscosity Ranges of Mineral Oils
  • Light Mineral Oil (e.g., Baby Oil):
    • Kinematic Viscosity: 10 – 20 cSt at 40°C
    • SAE Equivalent: Roughly an SAE 10 straight-weight motor oil when warm.
  • Heavy Mineral Oil:
    • Kinematic Viscosity: 65 – 110+ cSt at 40°C
    • SAE Equivalent: Roughly an SAE 30 or SAE 40 straight-weight motor oil. [1, 2]
Why They Differ from Car Motor Oil
  • No Multi-Grade Rating: Car motor oils use multi-grade ratings like 5W-30, meaning they contain special polymer additives (viscosity index improvers) that resist thinning at high temperatures. [1, 2, 3]
  • Lack of Additives: Pure mineral oil is a single-grade fluid. It lacks the detergents, anti-wear agents, and multi-grade polymers found in modern automotive engine oils, meaning it thins out much faster as it heats up. [1, 2, 3]
If you are trying to match a specific bottle's cSt measurement or need an equivalent for a particular mechanical project, let me know the exact viscosity numbers (cSt at 40°C or 100°C) from your data sheet.

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