Difference between Mobil 1 5W-40's?

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Originally Posted By: Quattro Pete
Originally Posted By: CATERHAM
But you should know that KV100 spec's tell you more about an oil's chemistry than anything else and don't correlate well with operational viscosity.

Operational as in dynamic viscosity?

Operational viscosity in terms of oil pressure which correlates with HTHSV and VI as explained in my read my thread, HTHSV trumps KV100:
https://bobistheoilguy.com/forums/posts/1990978/
 
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