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Best oil for 2004-2007 STI in 2021

26K views 20 replies 13 participants last post by  magma  
The best oil for the $ is good old Rotella T6 5w40 since it's available at walmart. IMO it's a little too stout for temps below freezing (my car cranks noticeably slower) so I run castrol 0w40 euro during winter. Motul 8100 xcess 5w40 is widely considered the best, but T6 is almost identical in both viscosity and additives.