I just talked to Valvoline 800# and she assured me that W85-90, GL 5 is correct for my Clipper. They also make Napa's brand.

I just talked to Valvoline 800# and told her that Packard calls fort SAE 90 for the differential and she assured me that their W80-90 GL5 is what I should use. The also said that they make Napa's brand so if Napa is out of Valvoline it is the same under Napa's brand. YES!!!

I see the distinction now. OK I will check that it is EP GL5 rated for my differential. Thank you for this information.

Maybe I wasn't clear. This Lucas W85-140 is for my differential, not the transmission, I know that transmissions take transmission fluid. I said gearbox thinking it was the same as differential. Several of you said that you use Valvoline W85-140 in your Packards for years and it is OK. I can still buy Valvoline but I think Lucas is a fine product. Any last suggestions, comments or warnings? I welcome the knowledge you all have. This is my first Packard.

I guess I was looking elsewhere. Thank you.

I've look everywhere and I can't seem to find any reference to the heater. Can someone direct me?

I just went on their Lucas' site and it says it exceeds all GL classifications and it is for older gear boxes.

I have a rebuilt Ultramatic with Mercedes Torque converter and clutch plate with passing gear. I bought Lucas w85-140 for my differential job tomorrow. Good, yes?

What gear oil did you use? Some say Valvoline w85-140, any suggestions?

Hi, I have a 53 Clipper Deluxe and I noticed tonight that my differential plugs are the same as yours. I am not a mechanic but I think I might try to change and refill it myself. The bottom plug is the empty plug right? And the silver one in your photo in the middle is the fill plug?? What is the black plug of the 3 plugs for? Much appreciated.