I'm hoping someone here can help me out. I just bought an old snapper push mower a couple weeks ago (think its a 78) and was told by the guy I bought it from he had changed the oil, cleaned and oiled the air filter, new plug, and replaced the drive belt. Well, the plug and belt do look new, but the air filter wasn't touched, and the oil looked awfully thin, like water. I took care of the air filter, but the oil was real metallic looking when I drained it, and super thin, even when cold. the engine runs great, doesn't make any unusual noises, and has a little end play in the crank, but no back in forth in the bearings. I got to thinking though, all the pictures I've seen of these with the 3.5hp briggs, show them with a dipstick tube, but mine doesn't have one, just the white plastic plug that threads into the fill hole in the bottom of the case that has the two little nubs on it you can stick a screw driver in to turn it off. I've only been able to find one other snapper like mine for sale on craigslist that had the same plug as mine and not a dipstick. I have the oil filled to the the threads for the plug, is this high enough, or is this thing supposed to have a dipstick tube and dipstick and have more oil in it? I can't use it until I get this straightened out. The snapper model # is V212P and serial # is 81020366. I'm not to sure on whether this is the original engine, or if the engine cover is different, as the sticker is all faded, but i swear I can make out 4h.p. on it, but the air filter when I look it up is said to be for a 3.0-3.5hp engine, and I don't think they used a 4h.p. on these until in the 80's sometime. The numbers off the engine cover are as follows- model # 92908, type # 1826 01, and Code # 77110208. Can anyone help me out? Don't wanna blow this thing up cause I didn't have enough oil in it.