Jackaroo diff oil

Submitted: Tuesday, Feb 17, 2004 at 20:18
ThreadID: 10601 Views:6440 Replies:10 FollowUps:1
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Just changed the rear diff oil on my jackaroo and now there is a growley noise after it warms up.I used castrol lsx 85w/90 as recommended by castrol with the Holden additive added.The manual says 85w/140 should be used.Iam considering changing it again to ,maybe a Shell synthetic, but its expensive. Has anyone got any suggestions what to use. By the way,the magic additive that Holden says to use and sells for $38 for a 125 ml bottle is actually Penrite limslip additive available from a Penrite dealer for about $14
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Reply By: The Banjo - Tuesday, Feb 17, 2004 at 20:36

Tuesday, Feb 17, 2004 at 20:36
There is a previous post on this very topic....Castrol tech lab told me to use the 84W140 so I do - NO additive requ they say - my 99TD SE is running well - could be that if you can hear a growl (from inside while mobile?) you might have more than an oil grade problem.I need red sand under me.
AnswerID: 47108

Reply By: Stephen K - Tuesday, Feb 17, 2004 at 20:44

Tuesday, Feb 17, 2004 at 20:44
Bango. I may have a diff problem but i am hoping its not.It seemed the noise began when I changed the oil.I had just completed a 18000k trip up north and dont recall hearing the noise before.I want to change the oil again just to see if the noise goes.
AnswerID: 47112

Reply By: Tuddy - Tuesday, Feb 17, 2004 at 22:37

Tuesday, Feb 17, 2004 at 22:37
Hi Stephen. I just read your posting and see that you used an additive in your oil. I'm not positive, but its possible that by adding an additive not manufactured by the same oil company you may void the warranty on the oil (so you should be careful). I know for a fact that my oil supplier will not guarantee his oil if an additive other than his is used. According to my oil supplier, the noise in your diff could be because you went to a lower grade than what was recommended. Tuddy.
AnswerID: 47140

Reply By: flashnick - Tuesday, Feb 17, 2004 at 23:55

Tuesday, Feb 17, 2004 at 23:55

Ive had problems with several oils in LSDs over the years, castrol and others were ok but not brilliant.

My suggestion -
Run with Penrite oils - there seems to be some confusion on this site re which oils are "high quality" and which oils are well marketed. There may be some confusion with names as well.
Penrite is a VERY high quality oil manufactured in Australia (and thats not the only reason it needs to be supported) it is exported to Over 14 major countries, ie USA Europe etc.
It certainly has the best limited slip diff products available for offroad vehicles. (Limslip range) There is no need for additives if you pick the right oil.

(Nissan owners should use the Limslip 140 everybody else needs the Limslip 85w/140)

Sure its a contentious issue and people get passionate about the product they use. It can be difficult to work out if some mechanics love it because its good or if they loathe it because it keeps em out of work.

Its also hard to work out if motors are getting made better or if the oils and lubes we use are getting better. I cant explain your growly diff but Im sure a change to Penrites product alone will solve the problem - check out their website for reccomendations and endorsements.

AnswerID: 47153

Reply By: Kiwi Ray - Wednesday, Feb 18, 2004 at 09:13

Wednesday, Feb 18, 2004 at 09:13
Additives are a good sales pitch marketed at the uninformed.
If an oil company wanted an additives in there oil it would already be in there
Check that the oil you used is actually the correct one. There has been many LSD diffs ruined by HP or Hypoid oils that were not suitable .
AnswerID: 47173

Reply By: Steve - Wednesday, Feb 18, 2004 at 12:00

Wednesday, Feb 18, 2004 at 12:00
The castrol oil that i used was the one recommended by them on their website even though it is a lower grade than it says in the handbook.I think i will try the higher grade but synthetic or mineral,thats the next question.
AnswerID: 47186

Reply By: The Banjo - Wednesday, Feb 18, 2004 at 13:21

Wednesday, Feb 18, 2004 at 13:21
Wait till you see the price diff between synthetic and conventional gear/diff oils.....it is quite dramatic (or was) - I used some synth for my gearbox - it was about $11 / L) - will probably return to conventional at some stage.I need red sand under me.
AnswerID: 47192

Reply By: dingdong - Wednesday, Feb 18, 2004 at 13:50

Wednesday, Feb 18, 2004 at 13:50
Hi Stephen

I use BP lms 90+wyns heavy duty gear suppliment in rodao,am retired mechanic & found most lms oils brake down at around 20,000 Ks . Every now & then when this happens because the clutch packs chatter instead of slipping smoothley, you would think back end is going to dropout.Also rear wheel bearings have only lasted 100,000 Ks on 2 occasions but this noise comes in on corners but gives increased transmission noise as it becomes worse.

Hope this may be some help.

AnswerID: 47196

Reply By: Stephen K - Wednesday, Feb 18, 2004 at 20:32

Wednesday, Feb 18, 2004 at 20:32
Thanks everyone for the information.I think I will go down to the oil seller and decide which oil to buy when I see the prices.Too many oils,too many decisions.
AnswerID: 47252

Follow Up By: flashnick - Wednesday, Feb 18, 2004 at 23:51

Wednesday, Feb 18, 2004 at 23:51
LOL. there is only 1 oil for that LSD of yours --- if you go off road and you dont like chatter.
FollowupID: 309269

Reply By: Savvas - Thursday, Feb 19, 2004 at 08:36

Thursday, Feb 19, 2004 at 08:36
Stephen ... Castrol LSX 85W/140 is claimed to be specifically formulated for Isuzu diffs. Check it out on Castrol's website under Consumer products and then choose Manual Transmission fluid. Scroll to the bottom and you'll find it.
AnswerID: 47285

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