VLSD... is there an additive for it or not?

[ricebike]

"Well, if it is a true vlsd, it is a sealed unit & u don't need that friction additive; that's for clutch-type lsd's only." me

Quote »Please do not say that. Nissan themselves use a BG LSD additive for the 350z and all other vehicles that have a VLSD. Yes, the VLSD has a sealed coupling w/ goo inside, BUT the gears on a VLSD still see friction and therefore need an additive to counteract that. Now, if the new fluid already has friction modifiers in it, like some Mobil diff fluids already do, then using an additive is not necessary. You can't just put some regular open diff fluid in and expect the vlsd to keep working down the road, its a slow death.[/quote] 10:32 AM 11/23/2005

This is NEWS to me! was I wrong all these years??? please Nissan service techs, answer this question & put an end to this urban myth once and for all!

I've done a search to confirm/deny this quotation, but can't find it.

I also have emailed the Parts dept of a local dealer to see...

"is there a special additive for Viscous LSDs? I know you have to add one to a clutch-type LSD, but I never heard of adding an additive for a Viscous unit that is sealed from the rest of the differential."me

Quote »NISSAN DOES NOT MAKE A ADDITIVE FOR EITHER ONE[/quote]Joe P. - Woodbury Nissan Inc.

I just want a confirmation, since not all parts people @ the dealership are as sharp as NICO's Online Technicians

Thanks in advance

[navysnail]

i am not 100% sure, but the parts of the differential that the gear oil is in contact with are the same as an open differential, so i would say no

[yellow_jacket]

friction modifiers are added to oils in order to let wet style clutches grab. There is no need for them in a sealed unit situation(vlsd).

That wonderful quote you provided is funny. Dry gears would see friction, that is why oil is in the system. Oil is this wonderful thing that minimizes friction. That is the entire point of using it.

[Badfish]

Been quite a few topics about this lately.

Heres one that I think will help.

zerothread?id=142079

I will be running Red Line 75w90 in mine. http://www.redlineoil.com/prod...ID=20

[ricebike]

yellow_jacket... yep I already know that u require a friction-mod additive for clutch-pack type differentials, but I want to squash this myth once and for all... via asking the service techs directly. asking 1 online parts counterperson about this only escalated my need to know & finally put this to rest.

that quote i got from the other thread is by skydragoness as seen on here:

zerothread?id=144781

Badfish, thanks for those links, but I read them & still not confirmed by a Nissan Tech...

Y i posted this in the 1st place... dunno about the partscounterperson's qualifications & want to back it up by the service techs as well...

@ least 2 out of the thousands of members here says there's an additive for the Viscous coupling... Sky, & from that other thread u provided Bad, Exar-Kun (a moderator)

Quote »Rule of thumb: If Nissan puts it in there OE, there's a GODDAMNED good reason for it. IF you honestly think you're smarter than the guys who designed the mechanichals of the car, you're definitely smarter than me. Sealed or not, the LSD additive is for use ina VLSD.[/quote]Thanks in advance for the techs to chime in on this & finally put this to rest.

[ricebike]

bump TTT for the2 techs to confirm/ deny this...

thanx in advance!

[ricebike]

Well, Joe from Woodbury Nissan just double-checked his database & emailed me again today.

Quote »I SHOW NO ADDITIVE AT ALL FROM NISSAN.[/quote]skydragoness or the Moderator, Exar-Kun:

Can you provide a link or something to confirm your statements? I'd greatly appreciate it. Thanks.

[s13sr20chris]

vlsd does not need additive. nissan does not use one for the viscous coupling. the gears are fine with regular hypoid gear oil(typical gl-5). i saw an article by redline once about this sort of thing. they were talking all about how bevel gears do not require the friction modifiers that are required by things like clutch type lsd's and m/t synchros. bg additives are good compared to other brands but if they didnt sell any snake oil thier buisness would be cut in half.

if anyone with an opinion on the subject would like to chime in i will put it to rest.

[ricebike]

thanks chris... sky & the mod, any rebuttal?

vote for sticky!