Thanks DC, I won't stress about the oil then for now.

Stechnic filled it with Total Synthetic 5w50 and I'm using the off the shelf Penrite Synthetic 10/Tenths 5w50 for top ups as the Total was impossible to get off the shelf the day I needed it.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...