The busa oil cooler actually cools the oil some, I'll wager. I don't think I've ever seen my temp go above half. The oil has never turned black after 2500 miles when I change it. The ZX-14 is the opposite. Has a regular canister without fins and I'm taking it off. Good source of oil for turbo and I think that's why they put it on the bike because it sure doesn't cool the oil.