FWIW, I know GZ3 asked about oil temps related to Pennzoil Ultra, but I want to point out that the only difference in oil temps I noticed was when I switched from the factory fill (which is non-synthetic) to a full synthetic (at that time I used Amsoil). My temps in stop-and-go traffic went down when I switched, but since then I haven't noticed any difference between Amsoil and Pennzoil.
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