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Old 05-24-2021, 11:48 PM #1
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Full Synthetic Gear Oil change interval

Decided to post in this section.

This will be my 3rd time doing this service on my 2008 T4R SR5 4x4. Every time i do this service Iím showing minimal fluid wear on my front diff, transfer case, and especially rear diff. For those wondering I am using Valvoline full-synthetic 75w-90 because it is cost effective and I replaced my fluid every 30k.

I have been using my car for 100% normal drives and 0% for towing or off roading.

I have researched on the forums and had little to no luck.

My goal is to not be cheap and at the same time not waste money on changing gear oil too early.

For fully synthetic gear oils, what service mileage interval have you guys been comfortable with...35k? 40k? 45k?

And what gear oil did you use?

Please share your experience, thank you!
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Old 05-25-2021, 11:52 AM #2
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Do i really need to change my differential oil?

How often should i change my diff fluid

Rear Diff Fluid Chang Question

Synthetic Differential fluid ?

Which Synthetic Differential Fluid to Use?

What gear oil? V8 4th gen 4x4

Which gear oil in rear diff
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Old 05-25-2021, 03:38 PM #3
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I used Valvoline gear oil VAVOLINE 80w – 90 GEAR OIL (conventional) in my 2005 4runner. They had no synthetic where I am.

I did the first ever Drain of three quarts at about 145,000 miles and plan on doing another after another 70,000 miles.

The interval of 30,000 miles isn't necessary IMO, but won't hurt.

I do no towing and no high-speed driving, and over 50 mpg seldom

My diff fluid was ok but black.

Someone posted that differential fluid doesn't ever need service, but I don't know about
that.

I've read some posters go 275,000 miles and never changed the rear differential fluid.

LIKE THIS POST below..

"I've seen many axles live past 300,000 miles on the original lube, but the stuff smells worse than dead dinosaurs should. It's enough to make most guys gag."

He didn't say these differentials had failures.

Last edited by FordF150; 05-28-2021 at 12:24 PM.
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Old 05-25-2021, 05:05 PM #4
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Full syn gear oil. 100,000 it doesnt gel or gum up. Most of the wear happens on break-in. Best to do it at 5,000 miles then synthetic every 100,000 miles with a quality lube like Amsoil. Just keep the breather clear.

When I have drained lube after 30,000 miles in the past, it looked like new fluid coming out and it didnt stink like conventional lube does. Its actually cheaper in the long run to go syn
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Old 06-01-2021, 03:19 AM #5
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I use Castrol Gear Oil. My rig seems to like it.
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Old 06-02-2021, 11:24 PM #6
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Just checked my diff breather and its in good working condition, that was a good tip!

Thank you all, you guys are the best. All this info helped out a lot.
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