This is a interesting observation regarding Subaru & PUP..In a recent post comparing QSFS to PP a member claimed that his Subaru went through PUP as if he'd "left the drain plug out". Has anybody else found their engine used more oil when running PUP?
I ask because I have a decent stock of this oil (SN rated) that I was planning to start using in my daughters Mazda CX-30 but won't if this is the case. Her Mazda burns no oil in the 5 to 7K OCIs that it's had using QSUD, M1, Idemitsu 0w20 syn. and PP and even with the Citgo syn. that Midas used when she was far from home. Since I don't get to keep an eye on the oil level of her Mazda as I do with my own cars I'd save the PUP for my cars if in fact it tends to burn off in some vehicles. (I'm pretty sure she never looks at her dipstick despite my teachings.)
PS: I even have 2 OCI's worth of the 5w20 SM PUP from 2010 that was a darling of this site when it first came out...I'll probably use it in my 2008 Corolla which was back spec'd for 5w20 and calls for SL oil on the oil cap.
recently w/ a Subaru 2.5L 2014 40 ish K miles, no mechanical issues and no noticeable oil consumption over the years..
I swapped out the dealer oil with PUP 0W20 & a OEM filter, filled up to the full mark on dip stick, (factory spec + .3 qt to get 100% on dip stick)
ran engine verified no leaks and re-verified oil level than sent the vehicle.
9 days later decided to just check every thing over for the client and was SHOCKED to see the level was UNDER the add mark in about 500 miles. Proceeded to add over a quart of PUP while thinking about my next move with the Subaru 2.5 as I really believe at this point somehow a mechanical oil consumption issue appeared.
A month later, and checking it every weekend since, well over 2500 miles the the oil level didn't drop a SINGLE centimeter after that...
Now onto the H/K's.
I swapped both of the 2.4L's over to PUP 0W20.. and both 2.4Ls showed initial oil consumption and then stopped. I have never had to add oil to the Kia 2.4L using M1 / valvoline F/S in 5W20, 5w30, 5W20 HM, Euro 5W30, or basically, any other grade mixture I have tried over the years.
When I say consumption specifically for the Kia 2.4L MPI that would be about 11 ounces of oil added after the initial oil change and consumption (maybe 500 miles) and then it levels out, and I never have to add another ounce for rest of the oil change interval.
The Hyundai 2.4L DI had oil consumption issues in the past because of incorrect coolant ratio making the engine run way warmer then it should, but since the coolant flush and replacing the near 100% straight coolant (user error over a couple years of adding over a gallon of concentrated coolant believing it was 50/50 wondering why the more coolant I add the faster it is burning off, and the engine oil was also turning pitch black and burning off) also did not show any miserable oil usage after W/ M1/Vavoline combinations. BUT W/ PUP like clockwork 500 miles later, check oil, add about 16oz, brings level to full, and level does not drop after that for the remainder of O/C..
Personally, I do not believe I will continue using Pennzoil and will not use it in clients cars, YES the "price was right" at Walmart around $24.89 5QT jug at the time, but the initial oil consumption on multiple different engines, and specifically the Subaru consumption was a huge turn off from Pennzoil for me.
(when I first started doing my own maintenance over 15 years ago, Pennzoil platinum / Ultra was the cats meow and used it religiously for a few years) somehow a decade passed and I have not used PUP. Tried it recently on multiple vehicles, all within a short time frame and could not recommend pup even if "the price is right", JUST because of the first hand multiple different engines that showed no oil consumption issues than all burned oil initially, and then the oil consumption stops.