Accidentally used GL5 oil in rear diff instead of GL4
Thread Starter
|
1st Gear
Joined: Jul 2009
Posts: 10
From: Richmond, VA
Accidentally used GL5 oil in rear diff instead of GL4
Car is a 2002 A4 3.0L 6 speed manual, quattro.
I was changing my manual transmission fluid and rear diff fluids today, using RedLine MTL 75W90 GL5 in the tranny, and RedLine 75w90 GL4 gear oil in the rear diff as recommended by the Audi shop.
When I changed the rear I accidentally put in 1 liter of the correct gear oil, and half a liter of the MTL. I know you don't want to use a GL4 in the transmission because of the synchros, but wondering if there might be any harm caused by the half a liter of GL5 rated oil in the rear diff?
I was changing my manual transmission fluid and rear diff fluids today, using RedLine MTL 75W90 GL5 in the tranny, and RedLine 75w90 GL4 gear oil in the rear diff as recommended by the Audi shop.
When I changed the rear I accidentally put in 1 liter of the correct gear oil, and half a liter of the MTL. I know you don't want to use a GL4 in the transmission because of the synchros, but wondering if there might be any harm caused by the half a liter of GL5 rated oil in the rear diff?
4th Gear
Joined: Mar 2009
Posts: 3,042
From: Indiana
I believe its the other way around; you do NOT want to use GL-5 where 'yellow' metal is being used, like brass syncros....
http://www.stealth316.com/misc/pennz...oilsummary.pdf
Mine says GL-5 is ok for front/rear, with GL-4 for the center and GL-4 for manual trannies. All Synthetic.
API GL-5 GEAR OILS ARE NOT INTERCHANGEABLE WITH API GL-4 GEAR OILS.
∗ The extreme pressure (EP) additives in most gear oils contain sulfur-phosphorus compounds that can be corrosive to certain “yellow metal” components, if present at levels higher than recommended by the equipment manufacturer. “Yellow metals”, such as copper and brass, are found in transmission synchronizers.
∗ The extreme pressure (EP) additives in most gear oils contain sulfur-phosphorus compounds that can be corrosive to certain “yellow metal” components, if present at levels higher than recommended by the equipment manufacturer. “Yellow metals”, such as copper and brass, are found in transmission synchronizers.
Mine says GL-5 is ok for front/rear, with GL-4 for the center and GL-4 for manual trannies. All Synthetic.
Thread Starter
|
1st Gear
Joined: Jul 2009
Posts: 10
From: Richmond, VA
See I'm even backwards about being backwards. You are correct, and I used the GL4 in the front like I'm supposed to, but mixed up a half a liter of the GL4 into the rear diff along with the GL5.
4th Gear
Joined: Mar 2009
Posts: 3,042
From: Indiana
Was this synthetic fluid? I was just reading up on this issue again, and it seems that most synthetics dont have the issue anymore, and in fact they are starting to use the 'GL-4+' or 'GL-4/GL-5/MT-01' labeling to announce this fact.
So, in the end, it'll be ok...
So, in the end, it'll be ok...
Thread
Thread Starter
Forum
Replies
Last Post
MKIV_TDI
B6 Models
2
Jan 9, 2014 09:33 AM
