During the recent "stop the oil leaks" saga with my TR4 GBX/OD I needed
to acquire a new stock of gear oil since my old (twenty years or so)
supply of API GL-4 gear oil (some Esso, some Shell) was consumed
between topping up the leaks and the several trys to solve the leaks.
I first made inquiry of the various oil companies (in USA only) easily
found on the web and asked if they had a GL-4 gear oil and what happens
if API GL-5 gear oil is used in an API GL-4 gear oil application. The
consistent and typical answer was, "...if an API GL-5 gear oil is used
in an application where API GL-4 gear oil is called for, chemical
corrosion of "yellow metal" components may occur, such as bronze
synchronizers, brass bushings, etc. This may lead to shifting
difficulties or shortened life."[Pennzoil web site] "Typically, GL-5
gear oil will have about 2 times the active additive level of a GL-4
Product. This additional additive can cause problems with yellow metals
such as brass or bronze."[Castrol tech email]
The only oil companies I contacted which said they had a GL-4 product
were Pennzoil, Castrol & Valvoline. Details follow:
Pennzoil Gear Plus GL-4 SAE 80W-90
stock # 21176 32 oz bottle
Castrol Hypoy Gear Oil GL-4 SAE
80W-90 35
lb pail(5 gal)
Valvoline Hydro-Lube Gear Oil GL-3 & 4 SAE 80W-90 part #
538 5 gal por-pail
I also found the following product in one of the local chain auto parts
stores (Trak Auto):
Sta-Lube Hypoid Gear Oil GL-4 SAE 85W-90 part
#SL24229 32 oz bottle
(div of CRC Industries, Inc)
At this time these are the product possibilities I know of in the US if
one wants to use API GL-4 in their GBX/OD. I bought 3 quarts of the
Sta-Lube brand for about $ 3.00 ea. (all that was on hand). TRF sells
Castrol Hypoy (cat #TRFGL4) repackaged in quart (32 oz) bottles for $
5.50 ea + shipping. Since I really didn't need 5 gals of gear oil, and
per Castrol their nearest stocking distributor was in Lebanon, IN with
none of their Illinois (where I'm located) distributors handling Castrol
Hypoy, I special ordered a case (12 quarts) of Pennzoil Gear Plus GL-4
SAE 80W-90 through my local auto parts store. In two days the oil
arrived, cost was $2.80 per quart + sales tax. I gave 1/2 the oil to my
younger brother who owns a '72 TR6 and we were both happy and back in
GL-4 for the foreseeable future.
brgds, Jay
'64 TR4 CT38895/LO Wheaton, IL
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