a week or so ago my '95 4runner sprung a leak (or so I thought)- i looked all over and finally found that the oil filter was loose... my 16yr old brother had changed the oil for me cause i was out of town and letting him borrow it... hes normally pretty good about things like this, and i went about 1500miles before it started. did he not tighten the filter enough or do the filters on the 3vz motors just work themselves loose every so often? has this happened to anyone else?