M1 FS Euro 0w-40, Val PB "Restore" 10w-30, 5.1K OCI, 07 GMC 6.2L

From what I understand, RLI BiosynXtra HD contains < 25% TMP esters. Virgin oxidation is 80-90.

It’s an alternative to using VPB Restore and is readily available if someone is unable to source the “rare” oil.
 
@jetman it is ok for the following mix
3qt VRB gen 2
3qt M1 euro 0w-40

I trying to maintain a 5W-30 viscosity for a 2yr or a 8K OCI. Changing filter @6, 12 and 24 months.
 
Wow that’s a hefty amount of carbon, something worked and I’d guess it was the Valvoline Restore that’s mostly responsible. I know you previously cleaned the pan back in ‘18 but after this removal did you notice if the varnish that existed in the internals of the engine had cleaned up any from what you could see?
When I opened/took it apart last summer there was still plenty of carbonous stuff remaining here are there, that's why I'm running a more potent/concentrated (33%) mix of VPB Restore for the current oci.
 
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@jetman, I enjoy reading about anyone using the VPBR. I ran it straight for several summers in my Ford Ecoboost 3.5 camper van, when I wanted a “longish” OCI, so I wouldn’t have to change it out on the road. Longish was 7k-10k, not that extreme; 4k-5k of each was highway.

Curious, if you ever considered blending the VPBR with Valvoline PBextreme, or whatever other flavor of PB you might like. The reason you might is that supposedly VPBR had “special base oils” but used Valvoline’s “PB” add pack. So IF that’s true, you might have a benign mixture, giving you some of the Restore cleaning action, without any concern for additive clash (though it doesn’t sound like you are concerned with that).

Just curious. At least some of the PB’s are dual-rated HDEO & SP. I led with the 5w40 extreme version because it is supposedly full Syn, whereas I think the 10w30 version is semi-syn.
 
07 Yukon Denali - As I mentioned I hoped to do this summer, I dug into the engine a bit to see what I could see, clean more internal parts up, and replace some ole parts (preventative mx).
Looks like MAYBE my mad scientist "MIX" for the last 6k miles of VPB "Restore" and M1 Euro "MAY" be doing a little cleaning (debris)?
Or "MAYBE" the debris is from ALL the various oils I have used in it the last 5+ yrs and 68k miles under my ownership.

I had the pan off in 2018 and totally cleaned it inside. These pic are from 2 weeks ago.
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Wow! Looks like something is def working. I think VRP is living up to its claims and then some. Thank yo for sharing
 
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