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This thread has devolved to ludicrous semantics lol (and with regard to the oil cooling - you can OVERCOOL your oil but you can also underhydrate for marathons - your counterpoint the equivalent of googling the opposite and slapping the first link to me as if it proves something. It doesn't). Ranting and raving about how it's not needed does no one favors and trying to convince others is dangerous for the longevity of the platform, especially now that the first gen is out of production.
Oil temperature is correlated to oil delivery and pressure. They cannot be considered mutually exclusive when accounting for engine protection.
Running heavier weight oil doesn't stop the empirical pressure readings (google it and the dozens of threads here that have hard data) where despite using heavier oil, pressures still drop off like a fucking rock past 230F, not to mention that the majority of oils are (for simplicity's sake, bringing tribology into this would be a can of worms no one wants) rated up to 100c and then everything after that is hard to get a gauge on.
Run an oil cooler unless you want to gamble with your car, but don't tell people it's not necessary because it's not going to hurt someone to put an oil cooler on a car versus running without one. It's better on the engine than merely swapping to heavier and heavier weights which retains heat even better which will result in subsequently higher temperatures, lower pressures, putting the oil even more out of its subsequently designed operating temperatures. This really isn't fucking rocket science. I'll take the word of people who have put actual money into producing safe to operate vehicles than one person's ranting anecdotes.
Saying "it's not needed" when we have many, many other sources that are a lot more professional saying otherwise is really dumb. And on that note, I wonder why many performance and race vehicles near ubiquitously use oil coolers despite "oil" being ""designed"" for 300f temps. The forester oil cooler is a welcome addition to the stock vehicle and is something that should have been part of the 1st gen to begin with. It won't protect from track conditions but it'll let you rip more than one redline before spiking oil temperatures severely.
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