>From the David Kee website (note sure how it will formaat in "plain text"):
OILING SPECIFICATIONS
BREAK IN
Fill your Toploader with any quality 75W-90 gear lubricant until the oil
level reaches the fill plug opening. It should take approx. 2 quarts. We
recommend changing the gear lube for the first time between 500 and 1000
miles to remove the grease used to pack the needle bearings that has
dissolved, Permatex, break in metal, glass beads etc. We use several new
parts in our transmissions and they will seat in with each other during the
break in period. It is not uncommon to see very fine metal on the magnetic
drain plug when you drain the oil the first time.
MAINTENANCE
We recommend changing the gear lube every 20-25,000 miles in normal street
driving applications. If you have higher than stock horsepower or drive your
car aggressively you should change the gear lube every 10-15,000 miles. For
stock type applications 75W-90 should work well in all climates. In heavy
duty applications and hot climates 80W-140 will work best.
ROAD RACE TRANSMISSIONS
Toploaders used in racing applications need a break in period. Put some
EASY laps on the transmission at low to mid rpm lightly accelerating and
decelerating in each gear. This will give the gears a chance to break in and
dissolve the grease in the needle bearings used during assembly. After a few
laps, drain the transmission and clean the magnetic drain plug, then fill
with 2 quarts of high quality gear lubricant. Once completed, the
transmission should be race ready. 80W-140 seems to work best for
competition applications. Change the gear lubricant after every race event.
SYNTHETIC GEAR LUBE
Synthetic oil is very popular in the automotive industry today. The way a
Toploader is designed it needs a certain amount of friction for the blocker
rings to synchronize shifts. We have had people try synthetics and say it
works great and some say it doesn't work at all. Everyone agrees that
standard gear lubricant does work. The biggest determining factor as to
whether it will work or not is the driver. If you drive your car normally
and shift it normally synthetic would be a great choice. If you drive
aggressively or want to shift fast then synthetic may not work well. If you
try synthetic gear lube and it does not work for your driving style drain
the transmission and try standard 80W-140 gear lubricant.
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