Anecdote: Once, driving across this great state of Texas to get to college, the tensioner pulley on my truck started sounding a little noisy. I was with some fr

Anecdote: Once, driving across this great state of Texas to get to college, the tensioner pulley on my truck started sounding a little noisy. I was with some friends and we wanted to get to school rather than wrench around, so I pulled over in the next town and bought a can of WD-40 and a spare pulley. I sprayed a bunch of WD-40 into the pully bearings, since WD-40 is a lubricant, and I hoped for the best. The pulley seized about 200 miles later. Burning rubber smell from the engine; loss of power steering, the whole nine yards. I pull over and get out the toolkit to take off the pulley. I had to use a breaker bar, but I finally got the danged bolt to start moving. Turns out, the bolt was reverse threaded. The whole tensioner needed replacing now. I called a tow truck. Don't use WD-40 as a lubricant. Also, don't slap quick fixes on critical components if you could take ten minutes to do it correctly.