100 Series Diff Oil

Submitted: Saturday, Jul 26, 2008 at 15:37

ThreadID: 60169 Views:12131 Replies:3 FollowUps:11

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Sir Kev & Darkie

For those who do their own servicing what is the best oil (cost and performer etc).
I have just been under Darkie checking the condition of the undercarriage including bolts after the Innamincka trip and discovered the rear Diff breather has parted ways. So I will now have to replace the diff breather and I'll do the Diff oil while I am at it.

Cheers Kev

Russell Coight:
He was presented with a difficult decision: push on into the stretching deserts, or return home to his wife.

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Reply By: Bushtrek - Saturday, Jul 26, 2008 at 16:00

Saturday, Jul 26, 2008 at 16:00

The best is Castrol LSX 90. I use it because it has additional EP antiwear due to its design for limited slip applications.
It also has Mack Trucks GO-J approval. This spec sets the gear oils apart for wear protection.

I would not use synthetics such as Castrol SAF-X or any other synthetics as while they are excellent for EP antiwear they are also very resistant to emuslification with water so if you get some moisture in the diff it will not emusify with the oil and remains as fee water which causes corrosion too quickly, like overnight!!

AnswerID: 317335

Follow Up By: Member - Phil G (SA) - Saturday, Jul 26, 2008 at 17:12

Saturday, Jul 26, 2008 at 17:12

I also use the Castrol LS90 and change it every 40k. Its the same specs as Toyota recommend.

FollowupID: 583654

Follow Up By: Sir Kev & Darkie - Saturday, Jul 26, 2008 at 17:58

Saturday, Jul 26, 2008 at 17:58

Thanks Bushtrek and Phil,

I only went and bought engine oil this morning for 20% off at Super Crap so will have to go back and pick up some Diff oil and a new hose and filter for the diff breathers (might as well do both in one hit.
How much oil approx for each diff is needed (RFS)??

Cheers Kev

Russell Coight:
He was presented with a difficult decision: push on into the stretching deserts, or return home to his wife.

Lifetime Member
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FollowupID: 583662

Follow Up By: Stu & "Bob" - Saturday, Jul 26, 2008 at 18:53

Saturday, Jul 26, 2008 at 18:53

About 6 litres will do both diffs with a smidge left over.

FollowupID: 583673

Follow Up By: Sir Kev & Darkie - Saturday, Jul 26, 2008 at 18:56

Saturday, Jul 26, 2008 at 18:56

Thanks Stu

Cheers Kev

Russell Coight:
He was presented with a difficult decision: push on into the stretching deserts, or return home to his wife.

Lifetime Member
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FollowupID: 583676

Reply By: mechpete - Saturday, Jul 26, 2008 at 16:35

Saturday, Jul 26, 2008 at 16:35

go with the synthetic , castrol SAFXA 75/140 . do it once and once only , finished for life ,Ive been using it for years
pete

AnswerID: 317337

Follow Up By: Member - Axle - Saturday, Jul 26, 2008 at 19:46

Saturday, Jul 26, 2008 at 19:46

Totally agree, 90 grade oil of most descriptions goes to crap if worked hard, Learnt that with final drives and diffs in all size earthmoving equipment.

Cheers Axle.

FollowupID: 583698