Nuttie425
Location: Cheshire
Newbie
Posts: 30
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« on: January 22, 2012, 05:07:50 PM » |
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I am looking to change the oil in my diff. it has been whining in the 10 years I have had the car but doesn't seem to getting any worse. can anyone recommended which oil or additive I could use to maybe quieten or prolong the life of my diff,
Many Thanks,
Martin
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carlton_mad
3.0 CDX and now Diamond 3.0 24v
Administrator
Wanted: Life
Posts: 5217
dartford kent
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« Reply #1 on: January 22, 2012, 07:31:11 PM » |
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which variant do you have?
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what would life be like if we all drove fwd cars? feckin boring that's what rear drive or bust
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Nuttie425
Location: Cheshire
Newbie
Posts: 30
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« Reply #2 on: January 23, 2012, 08:08:00 AM » |
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1993 2.0i automatic mate
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man of kent
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« Reply #3 on: January 23, 2012, 09:15:02 AM » |
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A thicker oil will quieten it just a tiny bit if you can find a thicker one. SAE90 should still be available although SAE 80 or multi grade seems to be more common now. Dont expect much.
Before hypoid oils came along, lots of old cars used to use straight SAE 140 but it was not hypoid. Worth a try? But the bearings will suffer a bit in the freezing weather as it will be quite thick.
The alternative is lots more sound proofing!
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OLD TECHNOLOGY WORKS!
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man of kent
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« Reply #5 on: January 23, 2012, 01:16:00 PM » |
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Yep. I would agree. Has the shock protection of the 140 and yet being a multigrade wiill not be too thick.
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OLD TECHNOLOGY WORKS!
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Nuttie425
Location: Cheshire
Newbie
Posts: 30
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« Reply #6 on: January 23, 2012, 08:42:56 PM » |
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Has anyone used the Redline product. Some horror stories as well as good feedback. I was just wondering as I know nothing whether anyone has changed their diff oil & with what grade and did they notice any improvement.
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man of kent
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« Reply #7 on: January 23, 2012, 10:28:40 PM » |
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On previous cars of all sorts I've changed the diff oil and never found any noise reduction. Donkeys years ago dealers used to put sawdust in the diff !. It works, for a while!
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OLD TECHNOLOGY WORKS!
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kevinfourlegs
The only TC member with four legs
Wanted: Life
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Am I the only TC member in south Wales?
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« Reply #8 on: January 23, 2012, 10:48:11 PM » |
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The diff on my estate was noisy when I lifted my foot off the accelerator pedal. The diff is quiet now. Had it changed for the one off my Diplomat. The diff was refilled with EP75W90.
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RWD, as it was, as it is, as it should be for real men.
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man of kent
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« Reply #9 on: January 23, 2012, 10:52:55 PM » |
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The diff on my estate was noisy when I lifted my foot off the accelerator pedal. The diff is quiet now. Had it changed for the one off my Diplomat. The diff was refilled with EP75W90.
Perhaps the newer multi grade hypoids break down? The old SAE80 and SAE90 stays that viscocity. Perhaps the multigrade diff oils need changing regularly like engine oil, but the manufacturers dont say that. I would assume like engine multigrades that the additives to make them multigrade wear out ?? |
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OLD TECHNOLOGY WORKS!
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melinx
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« Reply #10 on: January 23, 2012, 11:51:12 PM » |
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On previous cars of all sorts I've changed the diff oil and never found any noise reduction. Donkeys years ago dealers used to put sawdust in the diff !. It works, for a while!
If you read the bit in the link below, the 'Shock Proof EP Gear Oil' contains the modern 'high tech' equivalent of sawdust  http://www.opieoils.co.uk/pdfs/Redline/SynthGearOils.pdfI would go for the 80W/140 Gear Oil in that link though. |
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kevinfourlegs
The only TC member with four legs
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Posts: 1469
Am I the only TC member in south Wales?
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« Reply #11 on: January 25, 2012, 06:35:01 PM » |
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According to the Vauxhall Carlton driver's manual, the one supplied with the car when new, states on page 126:
Rear axle. Special oil, part no. 9 293 688 or SAE 90-Hypoid, for vehicles with limited-slip differential: only special oil, part no. 9 293 688
Copied it word for word. The reference number of the manual is TS 1189-B-93.
Hope this of some use.
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RWD, as it was, as it is, as it should be for real men.
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man of kent
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« Reply #12 on: January 25, 2012, 07:24:36 PM » |
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ABS site has a bit about the limited slip diff oil. The oil is standard SAE 90 with a special additive you get from Vauxhall. There words, not mine. there are a number of alternatives but I've no knowledge of these.
I do know when I bought a 6.6L Trans Am with a limited slip diff in Detroit, it had the wrong diff oil in it and it made a horrible groaning noise on corners. I had to change it. Also found that with the limited slip diff, it was very difficult to drive at any speed on ice! Corvette owners in the northern states of the USA put them away for the winter as they are completely undriveable. There are of course different levels of 'limited' so maybe our cars are driveable on ice.
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OLD TECHNOLOGY WORKS!
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kevinfourlegs
The only TC member with four legs
Wanted: Life
Posts: 1469
Am I the only TC member in south Wales?
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« Reply #13 on: January 26, 2012, 05:12:47 PM » |
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A 6.6L Trans Am is proper. V8 rwd all the way.
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RWD, as it was, as it is, as it should be for real men.
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