HOZZMANRX7

iTrader: (43)

Did a search, but one real answer I could find is this cut and paste observation from Icemark:

Redline Shockproof gear oil for the rear end (an add some Red Line Limited-Slip Differential Friction-Modifier/Break-in Additive if you have a LSD- which if it is a 88 GXL from your sig; it should).

Two questions:

1. Do you put the same LSD Additive no matter what type of LSD (disc, Torsen, etc)?

2. What are alternatives to Red Line Gear oil and additive.

- For instance, Royal Purple intrigues me. Anyone with insight or experience. I have to assume Royal Purple also provide an LSD Additive. True? Couldn't tell from their web site: http://www.royalpurple.com/retail/pr...products.shtml

- Other suggestions??

Individually, we're smart. Together we're genius. Thats why this Forum stuff is so great. Thanks for your responses.

Drive well, drive safe.

HOZZMANRX7

iTrader: (43)

Amsoil comparison (albeit dated 1995) to several other synthetics (including Redline) and non-synthetics.

http://go-synthetic.com/redline_vs_a...vs_amsoil.html

deadRX7Conv

No, LSD additive is needed on clutch/cone type LSDs.

Viscous fluid LSDs are sealed and quaife/zexel gear types use gears and neither need LSD additive.

Amsoil, Neo, Synlube, Redline, Mobil1, Royal Purple

HOZZMANRX7

iTrader: (43)

Anyone with experience on these alternatives??

deadRX7Conv

Mazdatrix pushes NEO.
RacingBeat pushes RoyalPurple.

I've used Amsoil, Redline, Royal Purple and Mobil1.
Synlube's cost is unreasonable at almost $35 a quart.

In the rearend, you can't tell the difference between any of them. In the 5 speed xmission, you can.

HOZZMANRX7

iTrader: (43)

What do you recommend? And, any idea which brand is the most cost effective?

deadRX7Conv

I use the Redline MT-90 in the transmission and this is the only fluid that I would recommend in any/all manual transmissions that needs 75/90 or 80/90 oil.

I use Mobil1 in the reargears because it is readily available at most car parts stores around here.
Both are reasonable at ~$8 a quart.

Amsoil/Redline/RoyalPurple are usually in the specialty speed/4x4 shops around here. They are usually $10-14 a quart. I haven't seen Neo or Synlube on any store shelves. If I do, I might grab some and give it a shot.

The words cost effective really don't mean much with transmissions/rearends. You change the fluid once and forget about it until a major service occurs(clutches/axles.......).

Cosmo Donk

I like NEO from www.bakerprecision.com .

breesej

I get my royal purple from NAPA auto parts at ~ $8 a quart for gear oil and ~$5.50 quart for motor oil. Check out your local NAPA auto part store, not very hard to find in SoCal.

HOZZMANRX7

iTrader: (43)

$7 per quart for 75W90 from my friends at Racing Beat, and it already has the LSD Molifyer in it.

Thanks for all the suggestions.