I have a 96 lowrider with a stock 1340 evo. When I got home last night I noticed a puddle of oil under it where the oil drain plug is. I tightned it up pretty snug. I went out this morning and there is still a little bit of oil under it. How tight should that plug be? There's also 2 other little tiny spots like the size of a dime under the front. A friend told me that vibration may losen up some bolts are there some bolts that specifiacally I need to keep an eye on? Thanks in advance for the help.