Which oil for 2022 wrx?

Hypothetical - could a dealer even tell if a 30 grade was used instead of a 20 grade? Just curious to what extent they would go if say you had a warranty issue and didn't use a 20 grade. I suppose they'd like to see records of oil changes to start.

You're talking about a HT/HS from 2.6-3.0 for most PCMO's today. Pretty insignificant. If they ran viscosity tests you're looking at mid 8's to 10cSt. The modern fuel economy 5w30's could potentially give you a tad more protection in theory.

I didn't realize the current WRX called for a 0w20 grade. I'd have no problems with a 20 grade but would highly consider a 30.
 
Hypothetical - could a dealer even tell if a 30 grade was used instead of a 20 grade? Just curious to what extent they would go if say you had a warranty issue and didn't use a 20 grade. I suppose they'd like to see records of oil changes to start.

You're talking about a HT/HS from 2.6-3.0 for most PCMO's today. Pretty insignificant. If they ran viscosity tests you're looking at mid 8's to 10cSt. The modern fuel economy 5w30's could potentially give you a tad more protection in theory.

I didn't realize the current WRX called for a 0w20 grade. I'd have no problems with a 20 grade but would highly consider a 30.
Yes, the first thing that most dealers would do is ask for oil receipts. I had an out of warranty repair performed on the turbo of my Forester XT (first of two repairs) and they didn't ask for my receipts since they know me so well and knew how anal I was about oil. The Service Manager had to go to bat for me with with District Subaru Rep. to get warranty coverage since I was at 62k miles and the rep. initially said no.

So not sure that I would advise going outside of Subaru's recommendation on a car that isn't mine (although I personally would have no problem doing it). But, @BMW Dom did say that the car isn't stock so "warranty" may be a moot point depending on the mods on the car.

All FA24 DIT's (Ascent, Outback XT, new WRX) spec 0W-20. The JDM WRX owner's manual recommends 0W-20, but also allows 5w30 and high SAPS Euro 0W-30.
 
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A higher HT/HS isn’t going to be the cause of engine damage which is what is tied to a new-car warranty. Higher HT/HS protects better and helps to prevent damage, not cause it.
Completely agree, but playing devil's advocate, I have heard of WRX owners getting grief from dealers for not using the specific grade in the owner's manual (even from just using a different winter rating). Some owner's just don't think it's worth the hassle getting into a disagreement with their dealer.
 
I suppose a lot of it depends on how much of a **** the service manager is about it.
 
It's either that or gross stupidity. Barring that it has to be organizational direction to minimize warranty costs at any cost since there is no mechanical or technical reasoning behind such behavior. I'd love for someone to actually prove the winter rating of an oil or give a detailed technical reason as to why it matters.

Actually I suspect that some of those "warranty denial" Internet stories are just that, stories to increase post count through fear mongering that looks good on a chat board. Usually posted by someone who thinks they know what they are talking about but obviously do not.
 
"could a dealer even tell if a 30 grade was used instead of a 20 grade"?

Any swinging body appendage can do a used oil analysis, if it got that far.
 
The WRX: It's my friends car. He wants an oil change kit for Christmas.

I asked him what oil he wants, and he didn't know.
Riskiest part of this whole thing is his car blowing up and him being convinced that it was your choice that caused it.

Not that tuned Subarus with upgraded turbos are known for blowing engines or anything.
 
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