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Castrol Limited Slip 80w-90 Oil #5378695 03/17/20 02:01 PM
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Oldswagon Offline OP
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I am working a Ford 9" differential with freshly rebuilt Trac-Lok clutch style limited slip. I am going to fill it with Castrol 80w-90 Limited Slip oil. Does this oil have the friction modifier already added? The guy at the parts store said it does, but not sure how knowledgeable he is.

Previously I always used straight gear oil and added the friction modifier separately. However this was the only 80W90 in stock.

Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378703 03/17/20 02:08 PM
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domer10 Offline
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Read the bottle, it will implicitly state it either way. Can be used or can not be used in LSD’S.


2013Jeep Wrangler Sahara Unlimited
2001 Toyota 4Runner
20010 Harley Davidson Rocker
Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378708 03/17/20 02:11 PM
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It says can be used in LSDs on the bottle but doesn't say if it has the modifier. Regular gear oil can be used in LSDs and open diffs too.

Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378712 03/17/20 02:19 PM
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domer10 Offline
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If it says it can be used in LSD then it has modifiers in it, if you want a sure thing then get something like redline or bottle that specifically says has friction modifiers.


2013Jeep Wrangler Sahara Unlimited
2001 Toyota 4Runner
20010 Harley Davidson Rocker
Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378718 03/17/20 02:22 PM
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Unless they changed their bottle Castrol is front and center with the words Limited Slip as on this one available from Amazon.

Castrol 80w90 limtited slip.PNG
Last edited by Snagglefoot; 03/17/20 02:43 PM.

If you want the job done right......do it yourself.
Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378724 03/17/20 02:32 PM
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domer10 Offline
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And if it says GL-5 on the bottle you are fine, this is why for my diffs I bite the bullet most times and purchase the most quality oil....so I’m not second guessing myself, especially having a Jeep.


2013Jeep Wrangler Sahara Unlimited
2001 Toyota 4Runner
20010 Harley Davidson Rocker
Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378819 03/17/20 04:03 PM
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Kira Offline
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Just went through my gear oil re-education before doing my Ranger diffs.
Limited Slip in the rear only. Total capacity is 8.3 U.S. pints.
The FM is ignored by the open front diff.
I was open to nonFM 80W-90 conventional (adding my own FM to the rear) but "everyone" sided with synthetic gear oils.
Also, the difference between 75W-90 and 80W-90 never came up.
Gotta find a different way to stick it to the man.

Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5378967 03/17/20 07:42 PM
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Randy_R Offline
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Limited slip has the modifier. I used Valvoline in my Silverado and I had Kendall in a 12 bolt with Positraction I still have. Brad Penn makes it and I saw something else at O’Reilly the other day. No need to add anything else.


2018 Mazda CX-5 6600 miles Zepro advanced moly 0W-20 Mazda filter
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Re: Castrol Limited Slip 80w-90 Oil [Re: Randy_R] #5379496 03/18/20 11:45 AM
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Originally Posted by Randy_R
Limited slip has the modifier. I used Valvoline in my Silverado and I had Kendall in a 12 bolt with Positraction I still have. Brad Penn makes it and I saw something else at O’Reilly the other day. No need to add anything else.


Thank you. I don't know why it just doesn't say that clearly on the bottle. I know it says for limited slip, but no where does it state it has additive. FWIW, I also confirmed this through Castrol. The emailed me back today and confirmed the oil contains the additive for the Limited Slip.. I will try it out and see how the LSD works. I can always add an oz or two if it chatters.

Re: Castrol Limited Slip 80w-90 Oil [Re: Oldswagon] #5379581 03/18/20 01:43 PM
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It’s what I’ve always used in the Tundra in my sig that calls for 80w90 LSD mineral and it works perfectly in my application, LSD still working great at almost 200k, change it every 50k or so, no chatter and never had to add any additives


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
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