I put a bit of lucas in my tranny with HD formula oil & today checked it after 2000 mile and I notice there is a white foam floating to the top.. It doesn't seem like a big deal, the formula oil is pretty thick oil anyway... I'm going to let it ride. It says right on the Lucas bottle to use 25% in transmissions. I won't add it next time though.


has anyone else tried lucas in the transmission?

 

Mine has the Bel Ray tranny fluid & it does the same thing.

 

Gearbox
Valvoline Gear Oil
85w-140 22oz

 

What's the reason for adding Lucas?

 

This right here Except my '13 Wide Glide needs 29 ounces to fill her transmission, the old 5-speed girls loved it too...

 

I don't understand half the stuff people do on this forum.

 

Foam pretty much means there is air being created in the fluid, you have two oils that are not mixing or not very compatible, in a nut shell you have air pockets between the gears of the trans ~ not good.

Drain it and put in the proper fluid with no additives, if you use a good syn fluid you don't need anything extra.

These slick 50 type additives are old and outdated with today's oils.

IMHO of course, company's that sell that crap may have a different opinion

 

THAT, makes a ton of sense!

 

What He Said.

 

Lmao! Yeah my bad guys! I'm still trying to figure this out, and I don't know how I even put it in that topic area. Sorry men, but thanks a bunch!