This is what I wrote in a previous post last year:
"The various versions of the 2016 WRX/WRX STI manuals, which includes US/Canada, Australia, Japan (English), Benelux (French) all say the standard oil for the STI should be 5W30, with use of 5W40 only for a short time and flushed out as soon as possible.
Having said that, when I hunted around looking for 0W30 many sites say it an alternative for 5W30 for lower temperature climates, but I didn't see anyone saying it would be bad for the car. The "0W" being more fluid and hence better lubricating on cold starts. The extremely important figure is the "30" and how it behaves when the engine is at normal temperature.
My feeling is that I don't think it's a problem, but I will contact the garage on Monday and just confirm things with them."
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