GL4

[Waterloo]

Go to Walmart, their house brand, Supertech, in a blue jug. If you are filling the rear end diffs, best to take truck to TA or Speedco, least expensive alternative, cheaper than buying by the gallon by a long shot. As far as Lucas, plenty written about that outfit, snake oil in my book. Best to stay with a real oil company, it is the additive package that they formulate that you want, not the J&J Baby Oil that Lucas specializes in.

I just checked Walmart pricing, $14.62 a gallon on their website...
https://www.walmart.com/ip/Super-Tech-Ge...n/16795067