Gear lube GL4 vs. GL5 spec - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 05-30-2009, 02:26 PM
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Gear lube GL4 vs. GL5 spec

Hi, When I first got my 69 Corona , I changed the gear and rear end oils with 80-90 wt. GL5 gear lubes I got at a large chain store. The transmission became very hard to shift and ground gears going into second. I actually started to shift from 1st to 3rd to avoid 2nd until it warmed up. At a motorcycle shop yesterday, I overheard the owner complaining about about EP gear lubes with the shifting on old Triumphs. The bell went off in my head and I did research in the Corona's owner manual and on the web.

Toyota recommends GL4 spec lube in the transmission and GL5 spec in the rear end of the 69 Corona. They are quite different and should not be interchanged. Most lubes on the shelves of stores are GL5 spec and you may need to hunt around some for the proper lube.

I have drained the transmission and have put in a regular motor oil to drive on and to use to flush out the GL5 I had put in. The transmission is shifting much better and I will replace with a GL4 Sta-Lube I purchased at a NAPA after I drive for approx 20 miles more.

I can feel the difference from the first shift and it seems to be getting back to normal. Be careful what you use and be aware that most will sell you GL5, if your not very specific on what you have them put in or purchase. Carl H
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#2 Old 05-30-2009, 06:04 PM
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Yeah, see my differential takes the lighter GL4 oil.

Bryan
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Other Toyotas : 79 Corona DLX sedan (Mint green), 89 Corolla DX sedan (wine), 88 Camry V6 LE sedan (blk), 86 Hilux std bed (wine), 82 Celica GT hatchback (bwn), 78 Celica GT coupe (slvr), 76 Corolla SR-5 coupe (wht)
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#3 Old 06-08-2009, 08:49 AM
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gl4 gl5 lube

GL4 or GL5 is the spec or additive package used in lubes they are not wt. Generally the are refered to a gear oil and hypoid . I wasn't quite happy with the Sta-lube and tried Amsoil GL4. The transmission is shifting much better and things seem back to normal. Amsoil re introduced the GL4 gear oil as i assume they had trouble with syncros working properly with their GL5 spec. I will try to ask a chain store lube shop to see what they use in transmissions to see if they have GL4 for the manual transmissions that require it, just out of curiousity...

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Yeah, see my differential takes the lighter GL4 oil.
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#4 Old 06-09-2009, 01:13 PM
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Sorry, I meant to say GL-5. I used a 75-90W oil I believe. They have heavy wt GL-5 also.

Bryan
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#5 Old 07-31-2009, 08:53 AM
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There are additives in the GL-5 that have an adverse effect on some of the parts in a manual trans.
Redline MT-50 improved the shifting a bit in my 84.

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#6 Old 07-31-2009, 11:48 AM
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Quote:
Originally Posted by fourwd1 View Post
There are additives in the GL-5 that have an adverse effect on some of the parts in a manual trans.
Redline MT-50 improved the shifting a bit in my 84.
I've heard a lot of good things about Redline from friends.

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#7 Old 01-30-2010, 10:45 AM
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Quote:
Originally Posted by Carl H View Post

GL4 or GL5 is the spec or additive package used in lubes they are not wt. Generally the are referred to a gear oil and hypoid . I wasn't quite happy with the Sta-lube and tried Amsoil GL4. The transmission is shifting much better and things seem back to normal. Amsoil re introduced the GL4 gear oil as i assume they had trouble with syncros working properly with their GL5 spec. I will try to ask a chain store lube shop to see what they use in transmissions to see if they have GL4 for the manual transmissions that require it, just out of curiousity...
Up date 1 /30/2010,,, I have changed to Redline MTL As my 1st to second shifting wasn't as good as i would have liked. The Corona book requires GL4 spec 80 wt. , the Redline MTL is similar to the required spec and the Corona is shifting better in the cold weather. Here is the product info, and there is a Reline tech sheet that explains the way the syncros work if you search the web. Remember gear oil viscosity numbers = rather this motor oil numbers ie. 5-30 wt. and the MTL seems to be the cure for my shifting.

Quote:

"Red Line MTL is a 70W80 GL-4 gear oil (SAE 5W30/10W30 engine oil viscosity) designed for use in manual transmissions and transaxles. MTL is a low 70W at very low temperatures, and a high 80W, nearly an 85W, at elevated temperatures, providing adequate viscosity to prevent wear and deaden gear noise. Overall, this gear oil provides excellent protection of gears and synchronizers, and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting."

The Corona 1900 4 speed requires a little under 2 qts to refill the drained gear box. I also lubed the linkage that is under the car by moving the boots off and lubing the linkage .
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