Valvoline R&P 5w30- 3,017 mi- 2022 Subaru Wrx UOA

[OilStainedNapkin]

With those wear rates I wouldn’t care one bit about the viscosity drop, especially given that your engine is specd for 0w20

 

[Fa24wrx]

It seems like all the API resource conserving/ILSAC GF-6A 30 grade oils slip to the 8.8-9.3 range within a short time (<2000 miles) even when starting over 10 and with less than 1% fuel dilution at UOA. They tend to stay in the high 8's or low 9's over very high OCI's though, even out to 10k miles unless fuel dilution gets really egregious.

I think they're engineered that way intentionally to meet the "resource conserving" requirements of API and ILSAC GF-6A. I asked folks on here about this as well as Lake Speed Jr. in an email exchange after SpeeDiagnostix did a UOA for me. Everyone assured me that this is normal and nothing to be concerned about, espcially in OP’s case since your vehicle is authorized to run 20 grade.

Yea seems like it. I ran it for 3k miles and had good results overall. I'll probably switch to Mobil 1 ESP 5w30 for summers starting spring of 2025