Valvoline VR-1 vs. Lucas Hot Rod oil

Wyrmrider said

66
take 40 weigt oil all warmed up
a 10 40 oil the W spec is about the same at 0 degrees and a 5W or 0W
The thin at o degrees w0 oil just does not thin out with heat
a o w oil flows better no matter what your starting outside temp is
but it is the same all the same warmed up
the modern ois do not have or have much less friction modifers

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Viscosity and flow don't really matter in the real world. I have never had a problem with oil up to 20w50 and SAE 30. No wear at all, over decades and 250,000 miles. And some of those vehicles were modern designs claiming I had to use light oils. Nothing gets babied in my garage. Isky will not warranty their flat tappet cams if you use light oil. You can use whatever you want. I would be a fool to change what I am doing. Use good oil, use a good filter, keep it full, and change it.