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Subaru !! Not sure they fit the best...
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Old 21 Mar 2005, 07:22 AM   #1 (permalink)
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Subaru !! Not sure they fit the best...

Having got the car back on the road after a long winter I decided to tackle a problem I had before the winter started.
Ever since I've had the car I've been a little concerned regarding a noisy rear diff.
The unit sounded a little too rumbly and also the LSD used to 'crack' with very little provocation. :evil: Obviously you expect the LSD to do it's stuff when required but this was getting silly.
So having purchased the recommended diff oil from Subaru I did a change yesterday. Apart from the drain plug being very tight the job was over in around 30 mins.
So off for a test drive. Can you believe the noise was worse than ever :cry:
As a last resort, before contemplating approaching Subaru under warranty, I decided to go to a good independant spares supplier in town.
After explaining the prob to the friendly owner there, who also happens to run an STi which he races, he asked me about the oil used in the diff. I told him it was Subaru 75W - 90 LSD which is the recommended oil.
He pulled a face and told me he would never use that oil in a Suretrac diff :shock:
He went in the back and brought me a litre of ATT 85W - 140 Pure Diff oil, suitable for all LSD's.
Well to cut an even longer story shorter the difference it has made is remarkable, smoother and quieter by far
Also did an engine oil change, even though it wasn't time to do so, put Mobile 1 5W - 30 in and again the engine runs smoother than with the Subaru oil especially at tick over.
Are Subaru fitting the best :?:
BTW the diff oil was 3.5 times the price of the Subaru oil :shock: but if it works better I don't care.

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Old 21 Mar 2005, 08:13 AM   #2 (permalink)
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Very interesting story cool nice to know about to diff oil ATT 85W - 140 8) keep that in mind mate.
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Old 21 Mar 2005, 06:44 PM   #3 (permalink)
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Well done mate, Hope the new oil is 3.5 times better!

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Old 22 Mar 2005, 11:57 AM   #4 (permalink)
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Hi Pete, Buzz,
Well I can honestly say that the oil is already 100% better than the OEM fit.
Also have been looking at other Scoob sites and it appears that others agree that after market oils can be much better at reducing LSD 'Clickerty Clack'.

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Old 23 Mar 2005, 10:40 PM   #5 (permalink)
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be careful with your engine oil as 5w30 seems too thin to me check this thread out http://bbs.scoobynet.co.uk/showthread.php?t=346896
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Old 23 Mar 2005, 11:51 PM   #6 (permalink)
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Hi Dave,
I've read that thread and I came to the same conclusion as you.
It appears that 'Oilman' is saying 5w-30 is too thin.
However, when I spoke to him directly and pointed out that 5w-30 is Subaru's recommendation, for my STi at least, his response was that I had mis-understood his post and that 5w-30 was perfectly acceptable :?: :?: :?:
Anyway, I have always had great faith in Mobil oils and having put in Mobil 1, my engine does feel smoother

Here's a link to an interesting site, long read but worth it if your interested.

http://neptune.spacebears.com/cars/s.../oil-life.html

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Old 24 Mar 2005, 10:13 AM   #7 (permalink)
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hmm like mobil 1 meself but used 15w50 motorsport in mine, to be honest i would sooner stick with the thicker stuff as yes the thin stuff lubricates the engine better from cold but how long is the engine cold for?and yes youre goin to get a few extra bhp from the reduced drag of the oil,but im more bothered about engine life when under extreme pressure and temp,so we can agree to dissagree on this lol (dont believe everything subaru tell ya-id sooner stick with what the specialist tuners reccomend)
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