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Old 09-01-2012, 06:17 PM   #1
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Mixing two different brands of differential/gear oils of same weight

I am thinking of flushing the rear differential oil as I do not know if it has ever been flushed in the past. The odometer reads 122,xxx miles. Better late than never. So, I purchased a quart bottle of a gear oil, Redline 75W90. Shortly after I found out that I need 1 liter of this stuff. I can't find the same brand around my town, but there are other brands with the same weight.

The plan was to replace tranny and differential on the same day. Has anyone mixed two different brands of gear oils with same weights? I don't see why this couldn't be done as most of the gear oils are compatible to others. Any inputs are welcome.

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Old 09-01-2012, 08:02 PM   #2
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1 L is probably close to what you need...I think that's my diff's capacity.

If it was me, I'd use the RL, close it up, and order another bottle to add to it...or just wait until you get the extra you think you need...which you might...but not much more at all.

I'm sure it's not horrible what you're planning, but the safe move would be to use the same fluid. If you beg at dealer, you know you can get the OE diff fluid...whatever that is.
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Old 09-01-2012, 08:10 PM   #3
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Yup. 1 liter is what I need to put. But as you know, the Redline bottles are 1 quart size(0.946 L). In the end, it is only 0.054 liter difference. I like the idea of putting the same fluid. What a waste of money to buy a second bottle for mere 0.05 liter. I guess it is better safe than sorry.

It always makes me wonder why US keeps imperial system while the rest of the world adopted SI. Oh well.

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Old 09-01-2012, 08:17 PM   #4
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If you measure the actual content of a bottle of redline I'll bet you find its got 1L in the 1qt bottle.

.05 liter is 1 oz... Fill it and drive...

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Old 09-01-2012, 08:33 PM   #5
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You won't even come close to draining the whole thing dry. Your one qt is fine
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Old 09-02-2012, 04:37 AM   #6
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Don't mix, the different additive packages can react!
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