I think some have done 38, havent seen 40, but I am not sure. I don't think it could necessarily hurt to try it.

I'm not a tech thgouh, thats just my opinion.

Alon

__________________
'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U