Hey. I recently purchased a 2023 Subaru BRZ (FA24) and the owner's manual calls for 0W-20 API SN/SP Resource Conserving or ILSAC GF-5/6A. After some research, it seems like the recommendation for 0W-20 is more for CAFE and EPA satisfaction, rather than engine performance and longevity. I'm sure using 5W-30 wouldn't harm anything outside of fuel efficiency (which is what I did in my Miata anyways when it called for 5W-20), however while researching oils, I went down the HTHS rabbit hole and now I'm looking at possibly using a Euro oil for the higher viscosity.
Does HTHS above 2.9 in the API/ILSAC specs for 5W-30 actually have value, or is it just additional headroom for when the oil shears? Seems like all the Euro oils have HTHS or 3.5 or higher for their manufacturer approvals. Also, I understand that most of the Euro specs are more stringent than API and ILSAC requirements, so there shouldn't be any compatibility issues with something like Pennzoil Euro L 5W-30 in my engine, correct? No issue with it being a mid-SAPs oil or that it's missing moly, tungsten, or titanium? That oil specifically has SN approval (not Resource Conserving), Dexos 2, and a few Euro specs. Any oil recommendations that you guys would recommend? I'd like something off the shelf if possible.
For context, the vehicle is in a southern state, warm/hot climate 10 months out of the year, will be used as a daily driver (a lot of short tripping, 5 miles a day commute both ways), and HPDE events or canyon carving on the weekends. I don't care about the factory warranty. If it really comes down to needing to use it, I will pursue legal action if the Subaru attempts to "void" my warranty. The manufacturer isn't going to be there to hold my hand if the engine blows a day late or a mile over. Any guidance would be greatly appreciated. Thanks.
