Hey All. My daughter just bought an '06 with 5 speed manual, with 112,000 miles, from a used car lot. After reading up on this forum I ordered some Redline MT-90 and went to change it. I jacked up the front end till the wheels were a few inches off the floor and opened the fill plug. I was surprised to see clean oil begin flowing out of the filler hole. Mind you, the front end was raised. After a minute it was still flowing so I opened the drain plug, drained, and refilled with my 2 qts. of MT-90. My worry is, if that was GL5 oil, could it have done significant damage to the synchros during the few months it was probably in there? All the oil I can find locally seems to be GL4/GL5 "compatible" so it was probably one of those.
I appreciate any feedback. I'm probably worrying over nothing.