Quote:
Originally Posted by JSeery
Not a war, just never heard of an issue with GL4 with yellow metal and most of the transmission rebuilders recommend it. I like T5z transmissions, ATF is not an issue!  |
In Canada GL4 is becoming a thing of the past as any I've been able to find say they meet and exceed GL5 ratings. Basically it is GL5 with a GL4 sticker.
If you run 140w mineral oil in the trans and cornhead grease in the clam, in theory as there is minor mixing back and forth between the 2(without a sealed rear trans bearing) a small amount of the EP additives from the cornhead grease will mix in with the mineral oil making it a GL3?? Maybe not, just a thought...
The easiest to come by here is Lucas GL4 which when speaking to their reps, they say it is not safe and will eat yellow metals. I use chevron SAE 140 GL1 which is ISO 460. It had 600W in it when I got it and is much happier now.