can i Utilize the oil cooler from a 99si auto? it comes with the in and out for oil cooler on the radiator itself...

 

are you talking about the trans cooler fittings on the radiator? The engine is going to produce more heat taxing the small radiator, i dont think you want to add engine oil heat into that mix. generaly the engine oil should be fine without a cooler unless your turbo and autocross the car at which point expense shouldnt be spared and a proper oil cooler should be run

 

And the 1999-2000 Civic SI EM1 never came in an automatic transmission.

 

But, Honda uses the same radiator, with a couple fittings for the automatic versions of other trim levels. Even if it were not originally installed, somewhere along the way it could have been.

Just get a proper oil cooler. They're not that expensive and you'll get better cooling. On that note, get a new dual core radiator also. They're like $40 on eBay.

 

honda does not use the same radiator for the em1 si as other trim levels. inlet/outlet is bigger on a b series.

 

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