HPL PPCO 5w-30 10k mi; 2007 Nissan Xterra 194k mi

[skiller1nc]

UOA here of my first pil change of HPL Premium Plus. 6 months, 10k on the oil, 65 miles of interstate every day so not really short tripped. Previously was using PP high milage fill syn so some of that was in the sump. I did run a qt of hpl EC on the prior oil change. What do yall think?

Link to prev uoa: https://bobistheoilguy.com/forums/t...ra-4400-on-oil-pennzoil-platinum-5w30.384412/

Lead is quite concerning, I read somewhere certain esters can spike lead idk if that's the reason here. Also concerned a bit about how quickly this has thickened, its almost out of 30 grade. Not sure what ppco starting oxidation is but I think its still okay but I'm not sure I would like to run this more than 10k. maybe once I get a full sump it could go longer. Also note that OAI thinks this is PP full syn so I need to call them to correct that.

Here is a snip of my excel sheet showing all previous UOA and trends.

 

[fantastic]

I think 12.6 = 40 grade but I'm not certain what this product viscosity starts at. I also think sulfur to be a root cause of the phenomenon of eating at copper, possibly also the tin, lead. With your 194k mileage could be just wearing out though. You do show that Pb has been elevated previously on PP HM but it's noticeably higher this time. Pretty sure Si comes from the HPL so the higher than the previous sample shouldn't be a problem. What is your plan from here?

 

[skiller1nc]

I'm going to run the same oil for 10k again. Now that it's on its second change of hpl PPco I'm expecting the oil itself to hold up better than the mix of penzoil and hpl from this run. I'll see how oxidation and viscosity look at that point and decide. I was hoping with my excess of highway miles that I could stretch the oci to 15-20k like WWilson but I'm not comfortable with that that just yet.

 

[RDY4WAR]

There's 2 possible reasons for the increased lead. Note, even if it is directly from wear, it's still just 4 ppm/1k miles.

1. Chelation - As esters clean, they can strip the oxidative boundary layers on soft metals. This usually calms down after a couple of oil changes.

2. Cleaning - Wear metals can become lodged in sludge and carbonaceous deposits over time. As the esters clean, these metals get released back into the oil. If you have a magnetic drain plug and/or filter mag, that'll catch the ferrous metal before it becomes lodged in sludge. This would explain why lead increased by way of cleaning but iron didn't.

The virgin KV100 is 10.7 cSt. It's thickened +1.9 cSt which is a decent bit but not alarming. If there's been significant cleaning, this would explain it oxidizing quicker, and TBN dropping faster, than expected. The virgin oxidation is ~25 abs/cm so you have a relative oxidation value of 20. The condemnation point is 30 so you're still good there.

It's difficult to determine much from a single OCI. I'd run another 10k mile interval and resample.

 

[JAG]

Looking at all three UOAs here makes me think that abrasives may be getting sucked into the engine. I would make sure the air filter is good quality, fits well, and is not past due for a change. Also make sure intake hose clamps are properly tightened. Lead is not the only metal with a higher amount than I’d expect with those OCI lengths.

 

[spasm3]

UOA here of my first pil change of HPL Premium Plus. 6 months, 10k on the oil, 65 miles of interstate every day so not really short tripped. Previously was using PP high milage fill syn so some of that was in the sump. I did run a qt of hpl EC on the prior oil change. What do yall think?

Link to prev uoa: https://bobistheoilguy.com/forums/t...ra-4400-on-oil-pennzoil-platinum-5w30.384412/

Lead is quite concerning, I read somewhere certain esters can spike lead idk if that's the reason here. Also concerned a bit about how quickly this has thickened, its almost out of 30 grade. Not sure what ppco starting oxidation is but I think its still okay but I'm not sure I would like to run this more than 10k. maybe once I get a full sump it could go longer. Also note that OAI thinks this is PP full syn so I need to call them to correct that.
View attachment 271712


Here is a snip of my excel sheet showing all previous UOA and trends.

View attachment 271714

Curious what filter you were running?

 

[skiller1nc]

Looking at all three UOAs here makes me think that abrasives may be getting sucked into the engine. I would make sure the air filter is good quality, fits well, and is not past due for a change. Also make sure intake hose clamps are properly tightened. Lead is not the only metal with a higher amount than I’d expect with those OCI lengths.

Around the time of that first UOA I noticed I had cracked rubber intake boots between the filter and throttle body. I've since fixed that, no cracks or leaks. And the air filter gets changed regularly and fits well, but I will double check to make sure.

 

[skiller1nc]

Curious what filter you were running?

Air filter is a fram ultra. Oil filter is stp extended life.