ZF5 fluid question + used oil into fuel question

[912504x4]

I have recently done a transmission swap from the E40 doa to a ZF5.
When I was filling the ZF I used 30 wt motor oil instead of ATF because I was told it may help the solid flywheel racket. I have noticed that the oil
seems to cause the syncros to act funny if it is cold out. If I drive it for a while above 45 degrees it shifts great into and out of every gear but if it is colder then second gear especially seems to be a tough one to get into.
I am feeling like I may try the ATF to see if that helps the syncros act right before I grind the gears too much.
What do you think?

When I pull the oil out of the trans. could I put it into the fuel tank and burn it? My fuel tank holds 28 gallons so it will be getting thinned down quite a bit after it sloshes around a few days.
I dont think it will hurt anything but thought I better ask first.

Thanks, Eric

 

[geonc]

Well it might smoke a bit

As far as the ATF....ZF reccomends Merc V syntheticI use AMSOIL full synth MERC-V and have a solid flywheel and really don't notice the rollover that much.

Others have serious rollover noise....I have heard Mel's...er...Suzies and his is what I would call extreme.....he has since changed to straight 30 wt and seems happy tho.

In my '90 IDI with 300 k mi I also ran AMSOIL with the solid f/w with little niose.

Wonder if those with the "Lucky" mod notice a difference in sound?

Possibly a frequency difference with the "Lucky" mod

NOT bashing Jim's excellent alternative by any streach ...just thinnin'

 

[DeeseSR]

I have 90wt in my ZF5 and on cold days it's hard to get into 3rd but the rest are fine. I made it accross country with it that way towing my wifes Yukon. It's probably been that way for years too. So the general concesus is to leave it alone.

 

[soulpatchfr]

never serviced my ZF , so i can't help there, but i wouldn't think twicw about burning the old stuff.
what's the capacity, anyway? IIRC, a couple gallons? i'm dumping anywhere from 3 - 4 gallons of used motor oil in each tank these days