First question, what does your engine builder recommend?
Second question how do you use the car?
I run 10w50 Millers Nanotech in mine but mine runs hotter than std even during normal driving as it's a 2.5. Do you have an oil temp gauge and what temps do you see regularly?
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter
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