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Should I run synthetic diff fluid to break in new gears?

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Old 04-08-2010, 09:17 AM
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Default Should I run synthetic diff fluid to break in new gears?
I just got new gears installed and need to add some diff fluid and do the whole break in thing. Should I use synthetic or stick with standard oil for the break in period.

I was planning on using Mobil 1 LS 75-90 synthetic gear oil.
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Old 04-08-2010, 09:26 AM
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No- do not use synthetic for break in.
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Old 04-08-2010, 09:36 AM
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Originally Posted by Dynatrac
No- do not use synthetic for break in.
Thanks! I will pick up some regular 75w-90 for break-in.

What kind of fluid do you recommend after the break-in period? The axle is actually one of yours. It is a Rubicon JK trail series set up for a TJ.
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Old 04-08-2010, 09:48 AM
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yup just use regular. ive done it way to many times
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Old 04-08-2010, 10:00 AM
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Originally Posted by gcally
Thanks! I will pick up some regular 75w-90 for break-in.

What kind of fluid do you recommend after the break-in period? The axle is actually one of yours. It is a Rubicon JK trail series set up for a TJ.
Royal Purple or Mobile 1 gear oil after break in.
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Old 04-08-2010, 04:37 PM
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Originally Posted by OlegFl
run the cheapest stuff you can find for 500 miles. Then go to synthetic
Yep! Dino for the first 500 then go with the good stuff! I use Mobile 1.
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