Thanks for tuning in Ken I was hoping you would set me straight.
Maybe you missunderstood me, I'm not mixing the two oils. I've been using the Mystik 80W-140, which is not a synthetic, in everything for 25 or 30 years and I'm still using it in the differential on my '50, 3600.
I just finished rebuilding the SM420 and thought I'd start out fresh with a synthetic in it instead of the Mystik 80W-140 like I had been using.
The labeling on the Mobil '1' is a little misleading then, because it says it offers: Outstanding protction of Hybrid differentials, Gear shifting ease and reduction of chatter.
So I just assumed they were including manual transmission in their recomendation.
Also from Mobil's product data sheet is this:
•Mobil 1 Synthetic Gear Lubricant LS 75W-140 is recommended for use in modern high performance vehicles like sport utility vehicles, vans and light duty trucks requiring API GL-5 performance that require excellent durability.
•Mobil 1 Synthetic Gear Lubricant LS 75W-140 is intended for initial fill, topping-off or refilling differentials, final drives, transfer cases and other gear applications where lubricants meeting API Service GL-5 and multi-purpose or mild EP gear lubricants are recommended
I guess I'll have to drain the thirty five bucks worth of Mobil '1' out and try to find some of the Delvac 50. I've never seen it in any of the local stores, maybe I need to ask for it. Looks like this manual transmission fill up is gonna cost me close to $75.
Thanks for the tip.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 08/29/2011 4:30 AM.
