mattn124

Hello;

I'm changing the fluid in my transmission for the truck in my signature.

NV4500 5-speed manual transmission.

I'm asking around on here to see what you guys think I should use.

All my previous changes have been with the factory-stuff from the dealer. however, Castrol stopped making Syntorq. There is a Moper offering but it's $26 a quart.

I have had good luck with Valvoline synthetics in my differentials, and am thinking about using it (Synpower 75w-90) in my NV4500. Here is my concern:

This oil says it meets GL-4 and GL-5. I remember years ago that when GL-5 came out it was a major NO-NO to put this in the NV-4500 as it has additive that corrodes "yellow metals", such as the brass-alloys that are used in this transmission.

But now I'm hearing that if the oil is marked for both GL-4 and GL-5 that is has been reformulated and is safe for my NV-4500.

Any thoughts on this?

Hoping for quick responses because I left the trans empty last night and wanting to refill today.

Thanks in advance for any and all replies

MikeR

Does GM still have any of their oil? they used the NV4500 for quite a few years too.

gorms

As far as I know, there aren't any reproduced oils that meet all criteria of the factory fluid. Mixed reviews on amsoil, but the factory stuff (even at $100+) is the best, IMO. Should be good for 50k or more unless you pull real heavy often.

jrs_dodge_diesel

As mentioned above, you may find it at a Chevy dealer:

GM Part # 12346190

patdaly

Don't know if I would trust a specific class like GL-4.

Quad has the correct stuff for 15 bucks a quart.

QU90020 NV4500 TRANSMISSION OIL 1 QUART in Shop Supplies: Lubricants

Castrol SyntorqLT 75w90w Full Synthetic Gear Lube

It's how I would go anyway.