[Roadsters] Changing transmission fluid...UH OH

[Pete Peters]

GL-5 is -NOT- equivalent to GL-4. Just Google for all the lovely GL-4 vs GL-5 discussions. Unfortunately, many uninformed parts folks will say you can use GL-5 in place of GL-4. From my reading, they're big time W-R-O-N-G. 

GL-5 is specified and okay for the rear end/differential, but you want GL-4 for the tranny. 

I'm no expert, but I would drain the GL-5 from the tranny, refill with GL-4, put a hundred miles or so on it, drain/fill with GL-4 again, and sleep soundly. 

Experts? Bueller? 

Pete 

----- Original Message ----- 
From: "Patti Dwinell" <fairlady1964spl310 at yahoo.com> 
To: "Andy Cost" <andycost at embarqmail.com> 
Cc: "All list" <datsun-roadsters at autox.team.net> 
Sent: Monday, August 10, 2009 10:43:26 AM GMT -08:00 US/Canada Pacific 
Subject: Re: [Roadsters] Changing transmission fluid...UH OH 

Only GL-4 !!!??? The newer GL-5 oils will eat my syncros!!??? 

I just checked the fine print on my bottle of Valvoline 80/90wt gear oil... that I just used!!... and it's GL-5. My specs say "GX", but my research revealed that it's an obsolete code. The older gentleman at "Orange Engine" concured it's obsolete, and recommended this Valvoline, stating it was the equivalent. 

Is there a difference in what to use between the 1500 and 1600s? 

I've used GL-5 in my differencial and steering box, too. Now what? Do I need to remove all the GL-5 from my car? Do I have to flush? and if so, with what? 

Yikes! I guess I should have known that this wouldn't be straight forward. 

Patti 

--- On Mon, 8/10/09, Andy Cost <andycost at embarqmail.com> wrote: 

From: Andy Cost <andycost at embarqmail.com> 
Subject: Re: [Roadsters] Changing transmission fluid 
To: "'Scott McGillivray'" <scottmcg at gmail.com>, "'Paul'" <9laser3 at bright.net> 
Cc: datsun-roadsters at autox.team.net 
Date: Monday, August 10, 2009, 3:56 AM 

Use only GL-4 gear oil. The newer GL-5 oils will eat your syncros. 
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