You're right.
The SAE grade on the bottle serves to confuse more than anything else. For example why is the first number smaller than the second on so-called multi-grade oils? All oils get thinner with increased temperature, so logic dictates the second number should be smaller.
A 5W-30 IMO in kinematic speak should read something like 500W-10 then everyone would get better picture of what actually happens with motor oil and temperature.
The SAE grade on the bottle serves to confuse more than anything else. For example why is the first number smaller than the second on so-called multi-grade oils? All oils get thinner with increased temperature, so logic dictates the second number should be smaller.
A 5W-30 IMO in kinematic speak should read something like 500W-10 then everyone would get better picture of what actually happens with motor oil and temperature.