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  #205  
Old 01-04-2014, 10:45 AM
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Here is an older thread discussing axle oils. Front Axle Differential Fluid: 75W-140 or 75W-85?


Worth reading too. Mentions official follow up from Jeep.

http://www.jeepforum.com/forum/f309/...84/index4.html
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  #206  
Old 01-04-2014, 10:56 AM
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Was booked to take the GC to the selling dealer for its 10k service. After looking at how little was to be done (oil, oil filter, rotate tyres) and the ridiculous price quoted ($483) I took it to the local KMart Tyre and Auto. They had the car for two hours and did a great job - they also balanced the wheels while rotating. Best part was it cost $266. I'll only be using the dealer for warranty, updates, etc.

BTW, is it reasonable for the dealer to provide a free loan car while the do the N58 recall? My dealer is planning to charge me for the loan car...
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  #207  
Old 01-04-2014, 05:23 PM
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Quote:
Originally Posted by Sovereign View Post
Was booked to take the GC to the selling dealer for its 10k service. After looking at how little was to be done (oil, oil filter, rotate tyres) and the ridiculous price quoted ($483) I took it to the local KMart Tyre and Auto. They had the car for two hours and did a great job - they also balanced the wheels while rotating. Best part was it cost $266. I'll only be using the dealer for warranty, updates, etc. BTW, is it reasonable for the dealer to provide a free loan car while the do the N58 recall? My dealer is planning to charge me for the loan car...
Take it to another dealer if they won't negotiate about the loan car.

As discussed in this thread, you can save a packet by supplying your own oils and parts when you do use a dealer for service work.

Two interesting articles on the merits or otherwise of having your car serviced by an independent:

http://autoexpert.com.au/owning-a-ca...ndent-mechanic

http://www.racq.com.au/motoring/cars...aler_servicing

The RACQ article makes some good points about why you should stick with the dealer network despite price, but it does pay to shop around and be prepared to take your car to another dealer. I have been quoted $600 difference for the same log book service between dealerships.
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  #208  
Old 01-04-2014, 05:36 PM
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Quote:
Originally Posted by SNUKE View Post
Here is an older thread discussing axle oils. Front Axle Differential Fluid: 75W-140 or 75W-85? Worth reading too. Mentions official follow up from Jeep. http://www.jeepforum.com/forum/f309/...84/index4.html
Thanks Snuke, I had seen the the first thread but the second link is interesting. However, I am still unsure of which to use. I have read a number of posts on various threads asserting the manual is wrong and the correct oil to use is 75W-85 on both front and rear, however, I can see nothing official from Jeep that corrects the owners manual. I assume the dealerships would just run with the service information in the manual unless there is a bulletin from Jeep that supersedes the manual.
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  #209  
Old 01-04-2014, 06:57 PM
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Re: Jeep service costs

My MY14 Aus owners manual is the same as the US one:
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File Type: jpg Screen Shot 2014-01-05 at 10.48.16 am.jpg (146.3 KB, 32 views)
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  #210  
Old 01-04-2014, 07:30 PM
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Re: Jeep service costs

Quote:
Originally Posted by selous View Post
I will be contacting Jeep on Monday, and the dealer I am taking it to for service to try and get some clarification but I'm interested in what others here think.
It will be interesting to hear what Jeep Aust say re the diff oils.

I remember in the early days putting in a Technical query to Jeep Aust re the Oil Volume for the CRD as it was stated as 9.6L in the owners manual and was likely incorrect due to other published data at that time.

After a few weeks and a follow up, they come back with that the owners manual 9.6L is correct, when those of us that had changed our own oil knew that could not be correct, not without severe overfilling. The proper volume was 8.4L with filter.
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  #211  
Old 01-04-2014, 07:57 PM
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Re: Jeep service costs

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Originally Posted by SNUKE View Post
My MY14 Aus owners manual is the same as the US one:
No good to me, I have a MY12. The manual for that specifies 75W-140:
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  #212  
Old 01-05-2014, 02:45 AM
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Re: Jeep service costs

My 2 cents worth, if you've got a tow bar and intend to use it, go with 75W-140.
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  #213  
Old 01-05-2014, 03:07 AM
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Re: Jeep service costs

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Originally Posted by BobT View Post
My 2 cents worth, if you've got a tow bar and intend to use it, go with 75W-140.
I do have a tow bar and 2 tonnes of boat to hitch up to it.

I take it 75W-140 is more suited to heavy duty applications than 75W-85? I note on the Redline 75W-140 product page it specifically refers to Jeep Grand Cherokee with Quadradrive:

Red Line Synthetic Oil - Gear Oil for Differentials - 75W140 GL-5 Gear Oil

Jeep
1993- 2007 Cherokee, Grand Cherokee, Grand Wagoneer, Wrangler Class III or Class IV hitch, towing package Grand Cherokee with Vari-Lock or Quadra Drive
2008-present Commander and Grand Cherokee all differentials
2005-2006 Rubicon with 226 rear differential
2002-2003 Liberty Front and '02 - '07 198RBI rear differential, '08 - 8 1/4" rear differential
2007-present Nitro 8 1/4"



The Product Page for 75W-85 makes passing reference to Jeep but doen't specifically mention the Grand Cherokee:

Red Line Synthetic Oil - Gear Oil for Differentials - 75W85 GL-5 Gear Oil

Popular in many late model BMW, Dodge, Jeep, Mercedes-Benz differentials, Toyota light truck, Lexus differentials and transfer cases.
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  #214  
Old 01-05-2014, 11:06 PM
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Contacted Jeep Australia about some other issues ( stuck in sand fix, nav fix) and inquired about the diff oil. They can't answer such technical questions and referred me back to the service dept at the dealership.

Spoke to the service dept at MacArthur CJD and they said that the manual is generic and not specific to the diesel JGC. They use LS90 in the rear diff and 75w85 in the front diff, so there is another alternative. I'm more confused than before.
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  #215  
Old 01-06-2014, 02:12 AM
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Re: Jeep service costs

Quote:
Originally Posted by selous View Post
Spoke to the service dept at MacArthur CJD and they said that the manual is generic and not specific to the diesel JGC.
Hi Selous

I don't think that the CRD has different differentials than other engine variants. I suspect that the guy may be confusing the service and warranty handbook as that is indeed a generic document however the Owners Manual is specific to the JGC.

Personally, I would run with (and do) 75w-85 front and rear for normal use however if you do a reasonable amount of towing, then I'd put in the 75W-90. There is a surprising amount of difference in viscosity between the 85 and the 90 so that should assist with the additional loads and shearing etc. associated with towing.

However as we are changing our diff oils every 40k then the effect of shearing on the oils over time is less of a concern.
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  #216  
Old 01-06-2014, 02:21 AM
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Re: Jeep service costs

Quote:
Originally Posted by selous View Post
I do have a tow bar and 2 tonnes of boat to hitch up to it.

I take it 75W-140 is more suited to heavy duty applications than 75W-85?
Yep, but only because high load implies high temperatures. If one adds high Aussie summer temperatures it becomes even more important. Remember that all oils are thick when cold and thin when hot. The 75W means that both oils act the same when cold (W for winter). They act as a 75 grade oil would act when cold. However, when hot, the 75W-140 acts as a 140 grade oil would when hot and the 75W-85 as an 85 grade when hot. So both oils are the same when cold but when heavily loaded and hot, the 75W-140 maintains about twice the viscosity therefore lubricity as the 75W-85. The trade-off is that the thicker oil will slightly increase fuel consumption.

In engines, another factor comes into play. Modern engines are built with fine tolerances. Thicker oils may not get into the narrow gaps as easily. This is not so much an issue with chunky diffs.
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