J Jwitt52 Joined Aug 15, 2020 Messages 2 Nov 30, 2020 #1 I’ve noticed while oil shopping some oil typically with higher viscosity ratings have red numbers and letter. Why are these numbers in red? Like Castrol 5w-50 or Mobil 15w-50 and a few others.
I’ve noticed while oil shopping some oil typically with higher viscosity ratings have red numbers and letter. Why are these numbers in red? Like Castrol 5w-50 or Mobil 15w-50 and a few others.
RooflessVW Joined Dec 24, 2011 Messages 14,389 Location North Carolina Nov 30, 2020 #2 Differentiation. If you look at Mobil/Castrol containers each visco has a different print/background color.
Differentiation. If you look at Mobil/Castrol containers each visco has a different print/background color.
