BG LSII Differential Additive

I just changed the differential fluid in my 2004 Toyota Tundra, which has a limited slip differential. I used synthetic 75W-90 and added a 6 oz. bottle of BG LSII additive. I didn't realize this when ordering it, but apparently you are supposed use enough additive for a 10% mixture. However, my differential took 3.5 quarts (112 oz) of oil for a total of 118 oz. of fluid. That is only a 5.1% mixture. Is it absolutely critical that I add another bottle? If so, I'll need to buy two more bottles ($20/bottle shipped) and four more quarts of diff. oil at $11 a pop. Pretty pricey mistake. FYI, I drove it a couple miles and there is no chattering or vibration but I want to be sure I am not causing any damage.

 

Well...personally...if it wasn't recommended by the manufacturer...I wouldn't have done it in the first place....but a thinner mix won't HURT anything, and I sure wouldn't go to the effort and expense of changing it again.

 

If you feel you must have it, take the oil pump that goes on gear oil bottles and stick it in the hole and pump out enough of the gear oil to allow you to add more additive.

 

That's a good idea. Assuming the oil and additive is mixed, pumping out 6 oz. (size of BG bottle) of fluid wouldn't decrease the oil/additive mixture percentage very much at all. I'll definitely consider it.

 

Mossman,

For future reference no additive is necessary.

Thank You
Amy

 

Amy,

I have a limited-slip differential. Therefore an additive is absolutely necessary.

 

Gentlemen,

BG LSII was developed to prevent chatter in plate and clutch type limited slip differentials, and it can be used with any GL-5 lubricant. It’s also excellent for eliminating chatter in full-time four wheel drive transfer cases. The ingredients used in BG LSII, add smooth and quiet operation to the gears in the differential and fortify the additives already found in gear lubricant. With all this being said, it’s not a NECESSARY additive.

Thank You
Amy

 

Not to get slightly off topic here but I just changed my rear lube in my Ford truck again. It has a limited slip rear and it also DOES require the extra additive. Ford has a special name for it but it's basically a friction modifier.

Yes.....the compound is already in the gear lube but limited slip differentials require a higher percentage of it.

Maybe BG LSII is not a necessary additive in most cases but some type of additional additive is needed in this application and apparently BG was used.

 

Yes....I read in several other forums, some Toyota specific, that they require additional additive for proper function....even with lube that says its good for LSDs.

Sorry I didn't know that before my first post Mossman. Never had those issues in my motorhead days.

 

FYI, I added a second bottle of BG LSII to bring the mixture to 10%, as stated on the bottle, and I now have driveline vibrations. I will now have to do another (expensive) drain/refill. I am in the process of trying to resolve this with BG to hopefully be compensated somehow.