You can also use Red Line MT-90. Yes, GL5 has a higher sulfur content that eats "yellow metal" like the brass syncros in our old gearboxes. G2 On Sun, 8 Aug 2010 08:01:52 -0500 "Tracy" <pepsifreek@xxxxxxxxxxx> wrote: > I replaced the oil in The Ghia years (and years) ago and had no > problem finding the GL4, I guess those days are gone. I was tracking > that GL5 had additives that were bad (corrosive) to our gearboxes, is > this something that “they” fixed with the newer synthetics? Is Royal > Purple a synthetic? > > > > > > From: tcb-bounce@xxxxxxxxxxxxx [mailto:tcb-bounce@xxxxxxxxxxxxx] On > Behalf Of Alma Jo Barrera Sent: Saturday, August 07, 2010 4:52 PM > To: tcb@xxxxxxxxxxxxx > Subject: [tcb] Re: 80W 90 GL4 > > > > I just had to get some for a friends Bug. I noticed that all the > synthetic gear oil was GL4 and GL5 compatible. > > > > Alma Jo > > ----- Original Message ----- > > From: mechmark@xxxxxxxxxxx > > To: tcb@xxxxxxxxxxxxx > > Sent: Saturday, August 07, 2010 4:43 PM > > Subject: [tcb] Re: 80W 90 GL4 > > > > I suggest Royal Purple 90 weight gear oil. > > > > > ----- Original Message ----- > From: "Tracy" <pepsifreek@xxxxxxxxxxx> > To: tcb@xxxxxxxxxxxxx > Sent: Saturday, August 7, 2010 9:25:12 AM > Subject: [tcb] 80W 90 GL4 > > I thought I had some in the garage but I was mistaken… > > > > I thought I could find some in one of the four FLAPS in Copperas Cove > but I was mistaken… > > > > Anyone have a source either local (to Texas) on online??? > > > > I still have what(ever) is in the transmission but I want to change > it out. >