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Old 03-13-2012, 07:59 AM   #1
lolol
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Default So, here's what differential fluid looks like after 200k miles metallic grey paint

So the beater I bought not long ago. 21 years old and 200k miles. I don't think the differential fluid's EVER been changed.

I bought the cheapest gear oil I could find at Wal-Mart. The new oil is much thicker for some reason (75W90). The new oil is almost colorless in comparison. Even less of a tint than motor oil.



The metal powder inclusion is so obvious it looks like metallic grey paint. The small streak of line that appears on the side as if light is shining through is from steel particles moving around from a magnet applied from outside.



The sludge that settled out on the bottom of the bowl I drained the fluid into. There's so much super fine steel powder that you could actually see the magnetic field pattern of the magnet.
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Old 03-13-2012, 09:30 AM   #2
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I had engine oil look like that before. Used cars can be so much fun. For the record everything was fine with my experience.
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Old 03-13-2012, 02:38 PM   #3
79letour
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It doesnt take 200k for the fluid to look like that. But some of the experts on here will scoff at you for changing it. Thanks for the pics and for making me feel better about the fresh clean oil in my diffs.
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Old 03-13-2012, 02:38 PM   #4
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It could be normal. Instead of seeing metal buildup for 20,000 miles (or whatever the change interval is) you are seeing buildup for 200,000 miles. The overall total wear might be the same. Is the diff making noise or anything?
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Old 03-13-2012, 02:40 PM   #5
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Quote:
Originally Posted by 79letour View Post
It doesnt take 200k for the fluid to look like that. But some of the experts on here will scoff at you for changing it. Thanks for the pics and for making me feel better about the fresh clean oil in my diffs.
Not changing if you are way overdue is true for auto transmissions, but it has to do more with the clutches an other stuff in the trans. A diff is much simpler. I've never heard of not changing diff lube that has high miles on it.
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Old 03-13-2012, 06:31 PM   #6
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Is it expected that differential fluid is eventually changed? The maintenance schedule says "inspect" which probably means checking the level from time to time, but doesn't call for replacement. Same with ATF.

I wonder if the old fluid, no matter how distressed it looks, it was just fine functionally.

Quote:
Originally Posted by Bacon117 View Post
It could be normal. Instead of seeing metal buildup for 20,000 miles (or whatever the change interval is) you are seeing buildup for 200,000 miles. The overall total wear might be the same. Is the diff making noise or anything?
There's some chafering sound that corresponds with vehicle speed. Noise continues when I throw it in neutral, so its differential and down.

The pitch always change with speed, but loudness varies from day to day. Sometimes, very obvious and other times you can hardly hear it.

When I checked the diff fluid (its an older FWD, btw) it was above "F" line.
The viscosity of the oil I drained is thinner than the new oil. Perhaps there's a leak and someone's been topping it off with motor oil?

Perhaps I wasted $12. I don't plan on keeping this car that long, so its questionable if changing differential fluid was of any benefit.
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Old 03-13-2012, 09:47 PM   #7
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Meh, we change diff fluid at 90k, and usually it looks like new.

Having said that, I wouldn't be too worried about that. As long as there aren't any big chunks and it's not making weird noise, then let it ride with the new fluid.



PS I read somewhere that Walmart branded oils are actually pretty decent stuff.
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Old 03-14-2012, 03:07 AM   #8
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Quote:
Originally Posted by 79letour View Post
It doesnt take 200k for the fluid to look like that. But some of the experts on here will scoff at you for changing it. Thanks for the pics and for making me feel better about the fresh clean oil in my diffs.


d000000000000d

i have seen the diff oil come out of a BRAND NEW less than 10 mile on it subaru that looked like it was 'old'

guess what??

it was the factory fill that had all the GOOD additives in it...made it look like it was metallic grey paint...but it wasnt


guess what??

lotsa morons out there dump perfectly good fluids thinking that they know what they are doing AND THEY DONT HAVE A BLOODY BLEEDIJNG CLUE AS TO ANYTHING
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Old 03-14-2012, 10:28 PM   #9
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Why were you draining diff fluid on a car with less than 10 miles on it?


PS: I should hope it was the factory fill.
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Old 03-15-2012, 07:24 PM   #10
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He just cant stand me posting anything in "his" little "expert" forum and no matter what I say he will always quote it and say something really smartassed with very poor grammar. Methinks he may have a drinking problem or just a lousy personality and perception of reality. Really Snotty, grow up man.
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Old 03-15-2012, 10:03 PM   #11
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Quote:
Originally Posted by 79letour View Post
He just cant stand me posting anything in "his" little "expert" forum and no matter what I say he will always quote it and say something really smartassed with very poor grammar. Methinks he may have a drinking problem or just a lousy personality and perception of reality. Really Snotty, grow up man.
sweetums...I just cant stand idiots posting **** straight out their asses...when you get some education on all of this...say in about 10 more years....call me and I'll school ya on where you are wrong

OK???

and you dont know **** about ME or **** about cars....so button your pie hole and learn something around here

Last edited by Uncle Scotty; 03-15-2012 at 10:11 PM.
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Old 03-15-2012, 10:04 PM   #12
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Quote:
Originally Posted by CosmoTheCat View Post
Why were you draining diff fluid on a car with less than 10 miles on it?


PS: I should hope it was the factory fill.
because the total and complete idiot owner though he knew better

just like some other total moron in here
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Old 03-16-2012, 05:39 AM   #13
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Spokn like a typical internet coward. Never an intelligent response from you Snotty. Youre just a sad pathetic excuse for a man. I feel sorry for your momma.
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Old 03-16-2012, 05:43 AM   #14
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Ps- where did you get your "education"? Since you brought it up, I've attended various tech scools for both mechanical and body work. Also the Yamaha and Kawasaki programs at MMI/UTI. Oh and my AA degree. Lemme guess- "I've done all kinds of reading"??? Thats usually your answer. Which judging from your lazy typing, abundant use of emoticons, and poor grammar, seems like you READ very little. Seems like all you do is patrol NASIOC looking to argue with all us "lesser beings" aboit oil. Have you ever received any formal education, specifically on oils?!!?

Last edited by 79letour; 03-16-2012 at 05:51 AM.
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Old 03-16-2012, 12:23 PM   #15
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****s about to get cereal.....try not to get put in timeout again Scotty
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Old 03-16-2012, 04:43 PM   #16
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Bros way too much conflicts over dirty differential fluid.
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Old 03-16-2012, 05:13 PM   #17
79letour
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Agreed. You cant post anything about oil in this forum without being personally insulted by this "man".
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