Sorry fellas, no updates on this, I really really wanted to see the results after the few oil changes and evaluate what kind of percentage of sludge was gone. Sadly I tried to contact the owner of the car, hence the GFs friend, but she is being a [censored] and wont really answer. Makes you not wanna care about her car I guess.
As for those of you curious about the GF, it was a mutual thing, we had different ideas about the near future, and nothing matched.
As far as my personal car, I reached 215k miles and had an interesting issue with it.
One day the car was low on oil and instead of picking up a quart to add, I saw the engine restore, and rememberd how a friend of mine used it on his car and he swore by it, he said it reduced oil consumption and he liked the results... so I grab a can 6cyl formula.
Poured it in the engine, drove home but that same night I went out to pick up a friend and while on the highway things appeared to be ok, but as soon as I got off the freeway and stopped at a light my oil pressure gauge bottomed out and practically all engine lights came on...
Slight throttle blip would bring it up but it would bottom out again.. I pulled off the road checked the oil, had enough in it.
Dropped the oil and the oil pan a few days after, and what I found inside was scary, inside the oil pan was what looked like copper or brass shavings quite large, you can see them with your bare eyes. Scarry, and then I looked online and noticed a lot of people having the same issues.
Now I can link this to the EngineRestore product, and perhaps the good quality WIX filter which must have got plugged up. It was rated at 15 microns filtration, and these particles were 20-30 in size.
New oil and new filter, oil issue was still there... so next solution was 200ml of Lucas Oil Stabilizer, and issue went away completely.
I'm on the second oil change now with no additives and haven't seen the issue at all.
So moral of the story, doesn't matter how old your car is, don't bother with additives like that, in some cases they hurt more then they help.
On the bright side there was absolutely no sludge or dirt inside the engine.
CHEERS Fellas.