Correct. 10W30 at operating temp has the same viscosity as 30W at operating temp (about 210 degrees) - when "fresh". After 100 hours of use though the 10W30 MIGHT (probably) have less viscosity than straight 30W after the same amount of use. The bigger the multiple between the "W" number and the last number the more likely the oil will break down - especially in conventional oils. 5W40 has a multiple of 8 - not nearly as stable as 15W40 (multiple of 2.67) (usually). 10W30 has a multiple of 3 and 5W30 has a multiple of 6 - the 10W30 is less likely to lose viscosity (use will lose less viscosity) than the 5W30 (USUALLY).
A lot of this also has to do with the QUALITY of the motor oil. A good QUALITY 5W30 MIGHT be able to out perform "Casey's" 10W30 that's on the shelf in the C-Mart. In my opinion 10W30 Castrol GTX is one of the best conventional motor oils you can buy - while the next guy will tell me I don't know &^%$ and it is something else.
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