Quote, originally posted by ryker77 » Syncromesh is offered in two different types from Penzoil and I think GM. One of the types is just for Gl4.
Amsoil also sells a version of syncromesh.
Can someone go into more detail on this? And officially reconfirm this.
I have Pennzoil Synchromesh (yellow bottle from Autozone) in my car for over 25k miles with no issues.