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Asinine oil question, but you all seem to be experts:
I have a BRZ and 2011 outback 2.5 that uses 5w30. I also have a case of M1 0W-40 left over from my E46. Neither sees track time. Safe for mixing in the BRZ as mentioned earlier in this thread (maybe when I get 1qt low) or a full swap in the outback?
Aside from that I love learning about oil, it's one of the things I'm just not as up to speed on.
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