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I considered the Forester oil cooler, but in the end I found it too expensive compared to the effect. From what I researched your 116 C sounds about right, I think they say 120 C on track. While it might be fine for the engine, the oil will deteriorate faster at that temperature, requiring it to be changed more often.
I already ordered a Setrab 13 row cooler, as a kit from HEL Performance for 340€ incl. shipping, from their ebay shop. I expect the temperature to stay below 110 C with that. Unfortunately they were too slow to deliver it in time for the track day. I spent a lot of laps cooling down (for brake fluid to cool too).
I am running Liqui Moly Special Tec AA 0W-20. And I will be sticking to 0W-20 as prescribed.
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