I thought that basically all manufacturer's these days specified their own brand of coolant. However, I'm thinking of maybe a new Subaru and downloaded the owners manual for a 2018 BRZ. Now I'm not sure what to make of an oil change quantity of more than 5 quarts, but I guess that wouldn't be a deal breaker, especially if I could find the 6 quart boxes of Havoline DS 0W-20. However, I noticed this in the section on coolant. Seems like they're basically saying it's OK to use something like Zerex Asian Vehicle Blue or maybe Prestone Asian. I guess there's also Pentafrost and Recochem. However, owners manuals I've seen before this always said "our coolant or nothing else" even though it's pretty well known that they all use a similar formula (no silicate, phosphates, and lots of sebacic acid). As far as I recall, it's not necessary to get everything exactly like the OEM, and often the OEM version would switch manufacturers with some inevitable changes.
Use either of the following.
â€¢ SUBARU Super Coolant
â€¢ Similar high-quality ethylene glycol-based non-
silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology
Do not use plain water alone. cdn.subarunet.com/ stis/ doc/ ownerManual/ MSA5M1806A_STIS.pdf