In my daily driver / grocery getter / road tripper, I like to go with M1 as it's a solid proven oil, cheapish and sold everywhere. However, nobody can determine what's really in it. Mostly III....III/IV....III/IV/V mixture? Who knows, and I don't want to start that redundant topic
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My thought is, just to be sure I'm getting a good dose of group V, can anyone see harm with substituting 1 Liter of a known Group V (Redline, Motul, etc) in place of 1 liter of the M1? That way, I'm running about 80% M1 and 20% Group V. I'm thinking I will start this regimen barring any objections.

My thought is, just to be sure I'm getting a good dose of group V, can anyone see harm with substituting 1 Liter of a known Group V (Redline, Motul, etc) in place of 1 liter of the M1? That way, I'm running about 80% M1 and 20% Group V. I'm thinking I will start this regimen barring any objections.