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does the engine have an oil filter? Such as item number 11 for example, http://www.marineengine.com/parts/m...oke/0g590000-thru-0g760299-usa/cylinder-block
if yes 4 stroke if no 2 stroke.
Have your engine serial number handy?
0G309834 is a 2 Stroke MERCURY TRACKER 25-HP (EL) 1996 Model Number 1025312SN
http://www.marineengine.com/parts/mercury_marine_parts/sn/0g309834
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=90-826883R03&_sacat=0