I've owned my Subaru 2024 BRZ (Canada) for one year, and it was my plan to run Amsoil 5w20 SS in it for the first season which I did. It is a 3 -season car only, put away in storage during winter. Very low use and miles, only 3,300 kms in one year of ownership. I dumped the factory fluid at 400 miles (600 kms) and ran the Amsoil fluid for the rest of the season. I have fresh Amsoil 5w20 in it now ahead of winter storage. I was not able to collect a used oil sample, it was my intention but I dumped it before I could get a sample. My car is very lightly driven, only casual street use, as a pleasure use vehicle.
My dealer thinks that I should be in there every 6 months for an oil change based on the warranty, but I am no where near the mileage recommendation. It was my plan to get a dealer oil change once per year just to keep them as friends in case a warranty issue arose. I think Subaru uses Idemitsu in their oil supply system.
As the car is in winter storage I've been thinking that I might prefer to just run a good quality over-the-counter motor oil that I can easily find at my local supply store rather than going through the Amsoil ordering/shipping process. I am also wondering if the dealer would make a fuss about Amsoil should there be a warranty claim needed. I do have an extended warranty. Amsoil is a bit expensive but I'm only doing one fluid change a year so price isn't a big factor. With the car only being used in 3-season weather I could run 5w30, I have avoided the 0w oils as they all have higher NOACK Volatility numbers, so I ran 5w20 instead of 0w20 in the past 12 months.
If I go to an over-the-counter oil I want it to have a low NOACK volatility number, I think that is helpful with a direct injected motor (though my engine has dual injection systems) . I was very pleased with the Amsoil 5w20 NOACK numbers. I would like any new oil to be a true Group 4 oil, not a Group 3. I also like to see a decent dose of Moly in my oils, complimented with some Boron. I'm open to 5w20 or 5w30. I'd really like a 0W30 motor oil but the NOACK volatility numbers all see higher on that viscosity compared to the 5w variants. A shear stable oil is also important, I've heard people report that the chain operation and design of this motor shears oil at an increased rate. The motor on this car was revamped in 2020, I believe it is rated for SN plus or higher, but an SP or SQ would be a plus for timing chain wear protection.
I think the only option in my region that might satisfy my requirements is Pennzoil Ultra Platinum, and perhaps one of the Mobil 1 formulas, I was very close to trying Liqui Moly for the 2026 season but I held back on buying it thus far, I think it is a group 3 oil. I might be able to locate Idemitsu Oil from local supply stores, but I don't know much about that oil. Is there any other oil that I might be missing on the list of potential oils I can run for the next season that checks all of the boxes ?
Thanks for reading and any suggestions.