Limited Slip Diff - Gear Oil????

[rcdave]

I have a new 2005 Tundra with the limited slip differential. I am nearing the mileage for its first gear oil change. In the past, I've always used synthetic Mobil One gear lube but in non-LSD rear ends.

Is synthetic gear oil suitable? Do I need to add an additive due to the fact that its LSD?

Thanks for the help!

[KLS]

Read the label on the gear oil bottle. If it says that it is suitable for limited slip differentials, then it already has the additive in it. I believe Mobil 1 gear oil does have the additive already mixed in. Yes, synthetic gear oil is completely suitable.


Ken

[grillmasterp]

Originally Posted by rve

I have a new 2005 Tundra with the limited slip differential. I am nearing the mileage for its first gear oil change. In the past, I've always used synthetic Mobil One gear lube but in non-LSD rear ends.

Is synthetic gear oil suitable? Do I need to add an additive due to the fact that its LSD?

Thanks for the help!

According to Mobil 1
Mobil 1 Synthetic Gear Lube LS 75W-90 contains special friction modifiers designed for limited slip-type differentials. In most applications, the addition of special LS (limited slip) additives is not required. For axles requiring the highest level of limited-slip performance, OEM specific LS additives can be added to this fluid.

Basically, I take this as it should not be needed but might be needed dependent on application. I have read that sythetic gear oil's inclusion of LSD additive is suitable for certain types(older) LSDs but may not really be enough for some of the newer LSD's- I will try to get more info- I was also told thatToyota has a TSB advising dino oil with additive over synthetic.

Check out this discussion
http://www.tacomaterritory.com/forum...ight=lsd+mobil

[tundrabrad]

My experience in using Amsoil 75W-30 Synthetic is that an additive is needed. Amsoil stated that it wasn't necessary but I experienced immediate chatter in the diff even with their Slip-Lok additive.

I added a tube of BG LSII friction modifier and the chatter went away. I now have Mobil 1 in the diff with BG LSII as well. I have no experience with Mobil 1 and no friction modifier.

Search 'LSD oil' and you will find many posts on the subject!

Brad

[pcosens]

Originally Posted by rcdave

Is synthetic gear oil suitable? Do I need to add an additive due to the fact that its LSD?

Go to your dealer and ask for the fluid spec sheet for your truck - they can access this and print it for you.

Likely it will still come up with dino gear oil specs for the LSD - with friction modifier. Toyota Canada sells LSD gear oil (see attached image) - repackaged oil from some standard supplier - and specs FORD LSD additive. Yes, FORD!

This is clipped straight from the Eaton site FAQ:
==================

Q - What type of lubricant and limited slip additive should I use with my newly purchased Eaton Limited Slip Differential? [ed: factory Toyota LSD??]

A - Eaton strongly recommends utilizing an API-GL5 approved Mineral-Based 80W-90 Axle Lubricant and one 4-oz bottle of Limited Slip Additive (GM or Ford).
====================

FWIW I use synthetic everywhere else on my truck.

Paul

[nhparrot]

Originally Posted by rcdave

I have a new 2005 Tundra with the limited slip differential. I am nearing the mileage for its first gear oil change. In the past, I've always used synthetic Mobil One gear lube but in non-LSD rear ends.

Is synthetic gear oil suitable? Do I need to add an additive due to the fact that its LSD?

Thanks for the help!

Toyota Specs

Front
Hypoid API GL–5
75W–90
1.2qts

Rear
Hypoid API GL–5
75W–140
w/LSD 80W–90
2WD 4.0qts
4WD 3.7qts
LSD 2WD 3.3qts
LSD 4WD 3.1qts