Lucas in the G56

[EricViviano]

Anyone tried this yet or am I going to be the guinea pig?

https://lucasoil.com/products/engine-oil-additives/pure-synthetic-oil-stabilizer

Truck is a worn out 05 with 250k miles on the truck. One of the first G56 trucks produced. It has had a hard neglected life. When I drained the trans the fluid it was black and there was a generous amount of metal on the plug. It still had the dual mass clutch, which is now in the scrap pile, and a regular flywheel and clutch is on my rebuilt engine. I don't expect this trans to make it to long, but you never know.

I already have this stuff around, it works outstanding in my high mileage work car. So I was thinking fill the G56 to capacity with ATF+4, then dump 1 quart of this down in through the tower.

Also keep in mind I live in the coldest part of the lower 48 so 50w is not an option.

Thoughts?

 

[Regcabguy]

The chatter of the G-56 with a smf clutch might demand a thicker fluid. Mine with ATF+4 sounded like a rock crusher.

 

[EricViviano]

The chatter of the G-56 with a smf clutch might demand a thicker fluid. Mine with ATF+4 sounded like a rock crusher.

Ya I was hoping the Lucas would take care of that. It's pretty darn thick, thicker than 50w for sure.

 

[04blackcherry]

Don't want anything that is too slippery. You want the synchros to work.

 

[mfurrh55]

Put in 50 wt. And cut it with 30wt. Synchromesh

 

[EricViviano]

Don't have 50w or Synchromesh. The main reason for attempting this was I have a 5 gallon bucket of ATF+4 and plenty of the Lucas. I'm going to try it, on this transmission I really don't think I have anything to lose. When it fails I'm going for the NV5600.

 

[RVTRKN]

You got the full life from your G56, get a rebuilt G56 with the AD gearing you have now. Have you just replaced the DMF with a SMF? If so your G56 is going to sound a lot noisier than it has, and seem like it’s worn out. Go with a 50wt (my favorite is Mobil Delvac synthetic 50wt trans fluid, and keep the G56 until it toast.