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On heavy duty trucks the oil cooler is actually a heat exchanger tied into the coolant bypass, allowing the coolant and oil to warm up at the same rate.
If and when the 2 systems remain separate other wise it takes much longer for the oil to warm up then it does the coolant.
I don't know anything about civics, but if the oil "cooler" is tied into the coolant, leave it alone.
I have read on here that other people with cars that do not have oil heat exchangers have to drive up to 20 miles to start getting their best fuel economy, just enough time for the oil to get up to full temp.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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