M1 FS Euro 0w-40, Val PB "Restore" 10w-30, 5.1K OCI, 07 GMC 6.2L
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Carryover triggers yellow flags on most of my result reports because I almost never run the same oil twice (mad scientist) 
OVERKILL
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How big is the sump? There will be some inherent variability and of course some additives that disappear (like Boron). My SRT's UOA has lower levels of phosphorous than either the baseline for the oil used and the previous oil for example. Here's my wife's 1500. Oil #1 is M1 EP 0W-20, #2 is the BL for the HPL SC 0W-20, #3 is the UOA. You can see Zinc stayed unchanged, while phosphorous shows a bit lower, as did Magnesium and Calcium:
I intentionally did not mention Boron because of that. As for sump?
These two came from our Volvo S80 with a 7.2qt sump:
Calcium starts at 2813, ends at 2369. Previous UOA had Ca of 840
Magnesium starts at 12, ends at 120. Previous UOA had Mg of 727
UOA: https://bobistheoilguy.com/forums/t...i-castrol-euro-5w30-a3-b4.375252/post-6668562
These two came from our CR-V, with a sump size of 3.7qt:
Calcium starts at 1702, ends at 1361. Previous UOA had Ca of 987
Magnesium starts at 11, ends at 95. Previous UOA had Mg of 693
Here's the UOA: https://bobistheoilguy.com/forums/threads/2018-cr-v-mobil-1-esp-5w30-4502-miles.373385/post-6618097
Obviously, this is most prevalent when previous oil has some widely different values than current oil, but it illustrates my point that unless you're sticking with the same (or similar) oil, you will occasionally see some significant differences just from carryover.
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OVERKILL
$100 Site Donor 2021
That's why I found Zinc on mine interesting, because even though the previous oil had massively less, the level wasn't reduced. You saw a 500ppm reduction in calcium going from an oil with 840, while I saw only a reduction of 171ppm going from an oil with ~1000ppm. Previous oil moly was only 76 but deviation from the VOA was almost nothing.
So, given these data points, can we just chalk the deviations up to dilution by the previous product? I don't think we can.
That is ridiculous.by the logic in this thread, you wouldn’t be able to switch oil brands or weights for that matter without fully disassembling and cleaning a motor.
Right, another reason why it is a fruitless endeavor. But to each their own. There is no guarantee of gain or loss.
It’s really not a lot different than mixing a qt of Hp EC into the sump for a slower cleaning.
great
Glad I could help you
Not really you did not really help me ,since it is not my thread, your point is invalid. HPL EC is specifically made to mix with oils, for a specific reason.
well, going by that logic, Lucas heavy duty oil stabilizer is also “made to mix with oils for a specific reason”. So is every other motor oil additive on earth. So they all must be better to mix with motor oil than, uh motor oil lol???
Do you wonder why HPL EC states in their product description this-
- Compatible with other conventional and synthetic engine oils
Dont care why HPL states as they do. I have no doubt that it is formulated to work WITH oils. ""Other" would denote "other than our products" I would assume, but you should ask them.
Do I know? Not really, I am not a chemist or oil scientist, but I have asked this question in the past to Valvoline, regarding Napa oil, and their answer was that there was no advantage, and the benefits of the oils would be degraded. Although they were blended by Valvoline, the products were different, and they did not recommend the practice on a regular basis on that point.
There will undoubtedly be mixing when doing an oil change. I think we have to look at how different engine may "hold" oil even when the oil is drained, even over an extended amount of time (i.e. draining overnight). Last year while I was doing an oil change and draining the oil and just letting it drip, I was preparing to do some other repairs. I jacked up the rear end and another half a quart of oil came out of the oil pan. As a result, I had to add another half quart during the fill than what I normally do. My guess is if I jacked up the front and each side, I may get even more oil drained.
Thanks for admiring you don’t really know what your talking about.
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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Oh my God!
How dare you perform an experiment by mixing a top notch oil with a top notch cleaning oil, and then provide before and after pictures of your experiment!
I hope you're happy with yourself, and your results, because you killed off all that varnish that you engine used to have in it!
How dare you do what you want with your own pile of engine oils and vehicle that you paid for yourself, and didn't listen to this forum on all our mixed ideas about life, the universe, and oil changes???!!!
You are a Bad Man for doing this, and shame on your willingness to do what you want instead of what others tell you!!
And don't you dare do any more experiments like this by telling us, and providing pictures, otherwise you will get scolded again by people who just can't stand it!!!
But if you do, I will look at everything you provide, but not actually look at it, because it might make me do something similar, but different.
You know, like putting 5 quarts of Valvoline R&P along with 3 quarts of Mobil 1 FS 0W-40 into a 2015 Porsche Cayman 2.7 L flat six engine with 66k miles on it. And I might drive it until the 70k mile mark. And I might have started this sometime in the past month.
We can't have you doing that, and causing others to things like what I might or might not have done.
It would bring shame on both of our houses!
Good Job!
How dare you perform an experiment by mixing a top notch oil with a top notch cleaning oil, and then provide before and after pictures of your experiment!
I hope you're happy with yourself, and your results, because you killed off all that varnish that you engine used to have in it!
How dare you do what you want with your own pile of engine oils and vehicle that you paid for yourself, and didn't listen to this forum on all our mixed ideas about life, the universe, and oil changes???!!!
You are a Bad Man for doing this, and shame on your willingness to do what you want instead of what others tell you!!
And don't you dare do any more experiments like this by telling us, and providing pictures, otherwise you will get scolded again by people who just can't stand it!!!
But if you do, I will look at everything you provide, but not actually look at it, because it might make me do something similar, but different.
You know, like putting 5 quarts of Valvoline R&P along with 3 quarts of Mobil 1 FS 0W-40 into a 2015 Porsche Cayman 2.7 L flat six engine with 66k miles on it. And I might drive it until the 70k mile mark. And I might have started this sometime in the past month.
We can't have you doing that, and causing others to things like what I might or might not have done.
It would bring shame on both of our houses!
Good Job!
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?
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