You're not in any immediate trouble.
Because (viscosity wise) 50wt SAE engine oil rating is equivalent
to 90wt SAE Gear oil. (and 30wt engine equivalent to about 85wt gear)
If you search the web you can find a chart that shows how the viscosities
compare.
What is different is the additives in the oil. Engine oil can have
additives that are not the best for your synchos.
On the flip side, most modern GL-5 Hypoid gear oil is also not ideal.
For this reason many of the lube manufacturers now offer a manual
transmission specific gear oil.
Examples are RedLine's MTL and MT-90. Royal Purple's MaxGear etc..
I had a crunchy second gear synchro on my datsun 5 speed.
I tried a lot of different weight transmission oils and I finally
put RedLine MT-90 in and the issue went away. It was expensive
but worth it.
Read this from ReadLine and it will explain better than I can...
http://tinyurl.com/3rybgwx
-----Original Message-----
From: spridgets-bounces at autox.team.net
[mailto:spridgets-bounces at autox.team.net] On Behalf Of James Lempe
Sent: Saturday, April 30, 2011 2:41 PM
To: Spridgets at autox. team. Net spridgets
Subject: [Spridgets] Transmission Fluid
I just put 80w-90w fluid in my '67 Sprite transmission, only to look in the
book and find out it should be 20-50w. I have not driven the car since ---
would it hurt the transmission to leave the 80-90 fluid in there, or should
I
drain it and replace with 20-50?
Thanks, Jim Lempe, Homer Alaska
A penny
saved is a government oversite!
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