SPYDERLK
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Yes, we are not. :thumbsup:No we are not.
I never said 5w-40 started out thin then got thicker.
Rotella 5w-40 is a 40 weight oil, it does not start out thin when cold then get thicker. It is a 40w oil.
Oil thickens in extreme cold.
The 5w-40 has additives in it to help keep it from thickening as much when very cold.
If you take a 5w oil and put it in the freezer it will thicken.
If you put a 5w-40 in the freezer right beside the 5w the 5w-40 has additives so it should still pore the same as the 5w in extreme cold.
,,,However; multiweights are "thin" oil that does not get thinner as quickly with heat. ... While viscosity of some oil bases is more heat stable, additives [as needed] inhibit thinning.