Hi sir , I am driving honda civic 92-95 (4drs) with B16A2 engine manual transmission . I had modify few things : - (1) upgrade ECU chipping to FEEL`s 5700-9600 rpm (2) 5 zigen 2" oval dual outlet exhaust and piping (3) modify close ration gear from 3rd/4th/5th gear The problem is , my engine oil keep reducing from time to time , such as I have to keep adding engine oil every week about 1 liter . I am using engine ol grade 15/50w . I heard some said the close ratio gear will keep the engine at high rev then will cause the engine oil reducing . some said the engine oil valve seal already leaking .... Need your help . Thank you .