jakesam

Hi I just recently purchased a 2007 sl 550. The locking mechanism works perfect. The filler door will close sometimes and sometimes not. I then have to hold the filler door closed then push the lock button on the keyfob. Then when i unlock the door it pops open. This is a pain at the gas station. A friend had advised me to spray wd 40 into the locking mechanism. I have concerns about the electronics. Any help would save me from mb service. thank you jay