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Hi guys I'm just about to install my built engine, I already had installed an oil cooler on my 32 Gtr in passenger side in front of wheel well. It's -10 and with last engine oil pressure on both factory and after market gauge read a bit low at idle. I did another Gtr (albeit after changing bearings) with -10 lines and -8 cooler (owner supplied) and it has perfect oil pressure. I'm aware this may be all due to bearing clearance but I was thinking should I add a reducer to -10 to -8 then back to -10 or just leave it as is?

Scott

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-10 in and -10 out is normal size for oil system plumbing. If the oil pressure is low then something else is causing it. You should be right to leave it. You could run a slightly heavier grade of oil which should help bump up the pressure.

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