I swapped out the old oil in my 1995 SAAB 900s's gear box and decided to try Synchromesh to see if would have any better shifting but what i do now have is a serious leak from the seal on the axle shafts that i did not have before. It seems this Synchromesh is just too thin and its coming out the seals. Would switching to 10W40 help this situation? Adding some BlueDevil snake oil did not help one bit. Im not looking forward to changing these seals..