Here is VOA of Mobil Turbo Diesel Truck 5w40 mixed with Mobil 5w30 at a 1:1 ratio. I ended up with an oil with a viscosity on the high end of 5w30, with a boosted Phosporus ( beyond the 800 ppm limit for GF-5 SN) but not crazy high. It also has a shot of moly and a fairly low calcium content. It’s currently in my 6.0 Chev LS V-8. Except for issues on base oil it looks a lot like Pennzoil Euro 5w40.
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