Actually 1/2 quart at 2500 miles is sort ? of normal, what oil were you using before ?,,or just run the HPL for a couple of oci and see if settles down on the consumption, it makes no sense why it is doing this, why are you using pricy HPL oil in the first place, if you are so concerned just switch brands. there are many options on the market.
HPL PCMO 5w30 - Subaru Outback 3.6r using oil
- Thread starter Swifty
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Beats me. It's always been that way for it too. More consumption at first, less later on. Opposite of what you'd expect. Once I started using HPL at extended intervals i realized its consumption would slow down greatly after 9-10,000 consistently. Currently 9,200 miles into using 10w30 No VII after 23,000 miles of Valvoline Restore and Protect changes. I would've liked to go longer on Valvoline Restore and Protect but needed to tow across country round trip and personally not comfortable towing 5w30 Valvoline Restore and Protect in that engine. 5w40 when its available if Valvoline Restore and Protect for that engine, towing.
not uncommon for cars to use oil I get your point. However in the 2/12 years I have owned this car I have never had to add oil and it has never moved off the full mark until changing to HPL. I had been using Amsoil XL 5/30 at 7500 mile intervals. Who said I was overly concerned? It is an observation and discussing it here is why this site is here. As for cost its my money and my choice. Given HPL's rep for extended drains I am experimenting as many of us do.
I still think cleaning or replacing pcv valve is next logical move. I have seen many subarus consume oil related to pcv valve including my own, even with less than 30,000 miles on the valve.
Just curious, What oil and filter did you run prior to going to HPL?
Amsoil XL 5/30 OEM Japan filters TR.
I'm going to throw out what I think may be happening, having used Amsoil products for 50 years. Their XL line of oils are a synthetic blend, so also contains "conventional" oil. A combination of factors have led to your vehicle having some carbon deposits. The HPL is now. beginning to remove these deposits. As stated earlier, stay the course with the HPL. It will serve you better than the Amsoil XL in the long run.
I used Amsoil Signature Series since 500 miles on the Pilot bought last year until the last two oil changes, when I switched to HPL Premium Plus PCMO. During this time, I found that using Top Tier, 87 octane gasoline from Quik Trip was contributing to carbon deposits seen in the oil filter media. Switched back to Shell premium and the two filters cut open since have shown a significant reduction in those deposits. The first OCI with HPL, the oil was pretty dark after 3k miles. The oil on the dipstick on this latest run barely looks darker than when poured in 3k miles ago. I guess it was doing some cleaning, even though I was using AMSOIL Signature Series. I'm planning on running this OCI for up to 10k miles.
I used Amsoil Signature Series since 500 miles on the Pilot bought last year until the last two oil changes, when I switched to HPL Premium Plus PCMO. During this time, I found that using Top Tier, 87 octane gasoline from Quik Trip was contributing to carbon deposits seen in the oil filter media. Switched back to Shell premium and the two filters cut open since have shown a significant reduction in those deposits. The first OCI with HPL, the oil was pretty dark after 3k miles. The oil on the dipstick on this latest run barely looks darker than when poured in 3k miles ago. I guess it was doing some cleaning, even though I was using AMSOIL Signature Series. I'm planning on running this OCI for up to 10k miles.
Viscosity increase during an oil drain interval since HPL uses very shear stable VM's.
I've thought this too. Except that it doesnt matter if I use 20,30 or 40 grade. Same pattern with each
How many miles do you have? GW started burning 3 quarts at 60,000 miles on high quality OTS synthetics in a 2018 Outback. Her friend in the same car pushed it back to 120,000 miles with Mobil 1 Extended Performance. So if you're not burning on AMSOIL XL that's a pretty good outcome.
I'm curious if @RDY4WAR @High Performance Lubricants might have some insight?
What? I don't think this is true. It's fully synthetic.
They do now sell a synthetic blend. It's a different product though.
I stand corrected. My bad. I guess I was thinking of their OE formula of old.
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Yep, that's true. My 0W-40 barely budged after almost 14,000km and was thicker than my shorter UOA of the same oil, which lends me to believe there was a bit of oxidative thickening at work. Had I kept it in longer, the visc would have increased past virgin.
OE is synthetic too. I think the first blend they offered is the new synthetic blend.
In my MIL's Buick, which was burning a 1 quart every 1,500 miles beforehand, the consumption did increase with the first change to about a quart low at 1,000 miles. By the 3rd change, it had slowed to 1 quart in 5,000 miles. The likely reason for this is cleaning of the rings.
There's a transitional period where enough ring coking is removed to reduce what sealing action was facilitated by the coke but not enough yet to free the rings so they can provide the seal on their own again. In that period, you can have increased oil transport past the rings into the chambers. Once those rings free up more, that seal will improve and consumption should slow.
There's a transitional period where enough ring coking is removed to reduce what sealing action was facilitated by the coke but not enough yet to free the rings so they can provide the seal on their own again. In that period, you can have increased oil transport past the rings into the chambers. Once those rings free up more, that seal will improve and consumption should slow.
