differentials oil change question - Page 2 - Toyota 4Runner Forum

seatia · 09-24-2021, 04:22 PM

Frankly I would do it.
With a new vehicle, I would do it before 1000 miles.
And the engine no more than 500 miles.
There is a lot of break in material suspended in the oil while the newly machined metals wear in to each other.

I just received Amsoil synthetic 75W110 GL5 severe duty gear oil for the diffs and Royal Purple Syncromax synthetic GL4 for the transfer case.
Also received the Toyota WS tranny fluid for a complete change.

If worried do an oil analysis, but a change will always help.

Bonniem · 09-25-2021, 11:11 AM

Which one would you use between these two

Hammer0313 · 09-25-2021, 11:31 AM

Redline is a fantastic product and highly recommend but I like the easy bags that Amsoil has. No need to pump the oil into the diff or transfer case using a hand pump. With the bag you just squeeze the fluid in and your done. Both are fantastic gear oils.

Bonniem · 09-25-2021, 11:34 AM

Yours says “severe gear” what’s the difference?

Hammer0313 · 09-25-2021, 11:36 AM

It’s just the name!

Bonniem · 09-25-2021, 11:38 AM

I see
Thanks

Bonniem · 09-25-2021, 11:40 AM

But what’s the difference between redline High performance and the other one

ElectroBoy · 09-25-2021, 11:51 AM

Quote:

Originally Posted by Bonniem

But what’s the difference between redline High performance and the other one

It might be different labels on an older product. The current product labels seem to be all oval. See the website:
Red Line Synthetic Oil. Gear Oil for Differentials

Hammer0313 · 09-25-2021, 11:53 AM

The front diff, rear diff and transfer case all have crush washers. Part numbers are:

Rear Diff drain and fill plug: 12157-10010
Front Diff fill plug: 12157-10010
Front Diff drain plug: 90430-24003
Transfer Case fill and drain plug: 90430-A0003

There super cheep, probably less than $10 bucks for all the crush washers.

02SE · 09-25-2021, 01:47 PM

Quote:

Originally Posted by Bonniem

But what’s the difference between redline High performance and the other one

The "NS" stands for 'Non-slip', that version lacks friction modifiers. It's intended to be more suitable for transmissions and transaxles, where the slipperiness of the standard 75w90, can cause issues with synchros or clutches in limited-slip diffs.

I'd use the 75w90 in your diffs. Although Redline does sell 75w85 which meets the current Toyota CAFE-inspired spec for the diffs.

Redline also sells this which meets the Toyota spec for the T-case: Red Line Synthetic Oil. MT-LV 70W/75W GL-4 Gear Oil

Although the Redline 75w90 would be just fine in your VF2A transfer case too.

Bonniem · 09-25-2021, 03:44 PM

I guess that would be my choice to cover rear and front if needed.

02SE · 09-25-2021, 08:06 PM

Just so I'm clear. I would NOT use the 75W90NS in the diffs. The standard 75W90 would be preferable.

We use lots of Redline products in a professional racing application.

Bonniem · 09-25-2021, 08:25 PM

I got it, thank you to be corrected

71gs3504sp · 09-26-2021, 07:52 AM

Quote:

Originally Posted by Hammer0313

This is spot on info and exactly what I experienced. I did my rear diff at 2966 miles and I was shocked at how the fluid looked and the amount of metal shavings on the magnet. One thing I would add is swapping the transfer case fluid from factory fluid to a 75-90 weigh gear oil smooth out the overall function of the transfer case.

For the transfer case oil I would only recommend using Toyota Transfer Case oil. I don't believe there is anything on the market that matches there specification. Toyota Transfer Case oil is specific for our 5th gen 4runners, it's expense but use the correct oil for this transfer case.

Nick B · 09-26-2021, 02:58 PM

Quote:

Originally Posted by Hammer0313

Redline is a fantastic product and highly recommend but I like the easy bags that Amsoil has. No need to pump the oil into the diff or transfer case using a hand pump. With the bag you just squeeze the fluid in and your done. Both are fantastic gear oils.

I’ve never seen those . Who sells them ?

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