Filter choices for '01 Pathfinder and '07 Altima

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I've currently got 9 PL14610 and 5 Mobil 1-110 stashed, and am wondering which one would better (if at all) to use for the next OC of these vehicles:

2001.5 Pathfinder (VQ35DE) at 127.3k - Mobil 1 High Mileage 10w40 (hopefully will slow a rear main seal leak)
2007 Altima (QR25DE) at ~91k - probably Pennzoil Ultra 5w30

I'm not certain whether either engine has any sludge or other buildup, I can't see much through the fill holes and I'm not going to pull a valve cover to look.

The Pathfinder was my mother's vehicle, bought new, and I've been driving it since 109k. No current issues other than the slow rear main seal leak, oil consumption is negligible. I've always changed the oil every 3k miles or so, and I'm uncertain of previous maintenance history since I wasn't able to dig up many receipts. The oil generally gets to operating temperature when I drive it. I've been having some extended idling recently (20-30 minutes usually, sometimes more) so I may be experiencing some fuel dilution.

The Altima was my brother's vehicle up until 80k miles or so, and now my mother is driving it. I also don't know much service history of this car, but it has no issues other than a fouled downstream O2 sensor. No oil consumption. I'd like to run Pennzoil Ultra for two or three short OCIs (3750 miles) to clean up any potential buildup. The car gets reasonable trips of 20-30 minutes of city driving most days of the week, so the oil gets to operating temperature.

So, which filters should I use for these applications, or will the difference be inconsequential? Should I save the Mobil 1 filters to use over multiple OCIs (probably with the Altima), and just use the PureONEs for the "cleanup" of the Altima and for my Pathfinder's short OCIs? Will the PL14610 fit fine on the Altima (since its spec is PL14612)? Should I switch to using the PL14459, which I've read is more efficient than the PL14610? I contemplated that earlier, but was unsure whether the different bypass PSI on the PL14459 would pose a problem.
 
Both are fine filters....with the edge going to the Mobil 1.

Two runs on the Purolator.....for 3000 +/- OCI's....

Three runs on the Mobil 1 filter.....with 3750 OCI's.

IMHO.....with the oils mentioned (Mobil 1 & PU)....you should at least double those OCI's. Save some $$$ and time...as well as resources. Your just much to conservetive. If you insist doing short OCI's, you may as well go to a conventional oil (Pennzoil conventional, VYB 0r Mobil Super 5000). Don't waste $$$ on top-tier synthetics.
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03' Ford Focus (2.3L Duratec PZEV) / 97,700
Pennzoil Platinum 5w20 / Purolator PureOne / OCI: 8,000 +/-
 
I was intending for the short OCIs simply to purge any suspended deposits that may have accumulated, since as I said, I don't know the precise service history of these vehicles and there may be significant cleaning going on. Is this unnecessary? If so, then I will double the OCIs for both vehicles as you suggest, as these are truly quality oils and filters. Perhaps I'll get one UOA for both vehicles to have a hint at how the engines are faring and if any issues are present, but I'm thinking that's a waste of money as neither are consuming any oil or coolant at this time. I see no reason not to extend the OCI.
 
Originally Posted By: Towncivilian
I was intending for the short OCIs simply to purge any suspended deposits that may have accumulated, since as I said, I don't know the precise service history of these vehicles and there may be significant cleaning going on. Is this unnecessary? If so, then I will double the OCIs for both vehicles as you suggest, as these are truly quality oils and filters. Perhaps I'll get one UOA for both vehicles to have a hint at how the engines are faring and if any issues are present, but I'm thinking that's a waste of money as neither are consuming any oil or coolant at this time. I see no reason not to extend the OCI.

You can purge any suspended deposits with a good conventional oil... like Pennzoil conventional...for those short 3000 mile OCI's...and then switch to a good synthetic....and extend the OCI to 6 to 7K.
 
I know that, but wouldn't Pennzoil Platinum or Pennzoil Ultra clean better than Pennzoil conventional, or would there not be much difference? If I ran PU for 7.5k in the Altima would I accomplish anything more than if I ran Pennzoil conventional twice for 3.75k? I'm just wanting to establish sort of a "clean" baseline before going for longer OCIs with synthetics with the Altima. For the Pathfinder I'll probably use conventional again if using Mobil 1 High Mileage for several OCIs does not improve my situation.
 
Use a conventional....with MMO....no more than 20% of your fill.
That combo should clean your engine nicely.... in two short changes (2K to 3K). Use a Purolator Classic for these two changes

Then switch to PU or PP or Mobil 1High Mileage (if your vrhicle is not leaking or burning oil...you can skip the High Mileage oil and just use a straight synthetic). These syns will continue to clean your engine. The Purolator PureOne should do the the job for 6K to 7.5K OCI's. The Mobil 1 filter might be a little overkill.
 
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But that would involve measurement, instead of just dumping in the 5qt jug!
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Perhaps I'll try that in the Pathfinder. But assuming I'd like to stick with straight oil for the Altima, there wouldn't be any advantage in running PU for 7.5k vs. Pennzoil conventional for 3.75k in terms of cleaning?
 
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