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I added the OEM oil cooler last spring and recently started using the block heater again now that the weather cooled off a bit. The oil cooler didn't seem to noticeably affect the operation of the block heater. It still heats the coolant to the same ~50 degrees over ambient temp and gets hotter than heck, but I guess it must be fine since it's still working perfectly.
In case anyone wonders how much I paid to add the oil cooler:
$80 for the oil cooler with center bolt, new O ring, and coolant fitting
$160 for a 2011 Civic Si water pump/housing
$28 for new OEM hoses
$4 for new coolant fitting O rings
$65 for a new OEM thermostat (not needed, just preventative maintenance while it was apart)
Total cost: $337 including new thermostat
I'm not sure if it was effective yet since I still don't have an oil temp gauge, but I feel better about driving on those very hot/cold days having it there to help warm up/cool off the oil and at the very least I don't have to worry about it causing any problems since it's a 100% OEM setup.
As soon as I have an oil temp gauge, I'm definitely going to do some testing to see how effective the OEM cooler/warmer really is and report back since I haven't been able to find any data at all on its effectiveness and I have wondered about it for so long.
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