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I always used VR1 in my race car with great results.  When it was super hot out, I'd run 20W50, but I'd usually run 10W40.  I am trying to buy some now for my street Z and I cannot find it anywhere.  They still sell 10W30 and 20W50 on Amazon, but the 10W40 seems to be gone.  Valvoline's website still shows 10W40 VR1, so it's not discontinued.  When I lived in MI, my local Napa store always carried all viscosities of VR1, but in AZ, I can't find anybody that stocks it at all.  Amazon only has 20W50 and 10W30.  Here in AZ, the Fall/Winter temps range from lows of 30F to highs in the 80's, so I think 10W40 is still the best viscosity.  Should I keep looking, or switch to something else that's easier to find?


I would think mixing different weights of the same make oil would be okay, but not ideal, or convenient.  Here's a handy ZDDP chart if searching for another.  I can't believe what oil costs nowadays!

https://www.speedwaymotors.com/the-toolbox/zddp-content-chart-high-zinc-oil-list-brand-breakdown/32479

 

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