How do i find the engine number for a 2.5ltr Mazda MPV 2000?

I got an MPV 2000, also had challenges identifying where the engine number is. Had to call in a mech, but you can DIY, you can read the engine number from beneath the engine not too far from the oil filter, or somewhere very close, cos the mech didnt have any problem locating it, got the engine number out in a minute.