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joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I have my tranny out right now, and got to thinking it might be a nice time to upgrade my gear oil. I have been avoiding putting Mobil 1 in for a long time because I heard that it attacked bronze syncros. Is this unfounded crap, or is there some substance to the fear??
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87 924s
88 924SE gone
447 hp cgt clone
87 924S gone
84 944 sold
83 944 sold
89 turbo S LSD, ABS etc
86 951 white rocket
85 944 sport everything.
84 944 sold.
87 944 sold

Tigger937 · Posted: Sun Dec 09, 2007 3:18 pm Post subject:

Don't know about Mobil 1, but I've tried AMSOil was not too happy with it as the shifts were not very smooth. Switched to PCA recommended Swepco 201 and wow.........what a difference. Been running it ever since. http://www.allzim.com/cgi/sh000001.pl?REFPAGE=http%3a%2f%2fwww%2eallzim%2ecom%2facatalog%2findex%2ehtml&WD=swepco&PN=copy_of_SWEPCO_201__GL5_gear_lube_80w90__1_gallon%2ehtml%23a1_21201G#a1_21201G
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1981 931 (Concours)
1982 931 (Daily Driver)

"Think outside the box"

johnathan1 · Joined: 08 Oct 2007 Posts: 308 Location: Downey, Ca

Not sure about Porsche trannys, but in the Supra scene...everybody uses and swears by Redline MT-90 gear oil. Apparently it is one of the best, and has been known to greatly improve the feel of the tranny, especially if the synchros are worn. I don't have any firsthand experience with the redline oil, but if 100+ people are saying good things about it, then there must be something good going on?
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-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL

WARNING: MAY CONTAIN TRACES OF AUDI OR VW!

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Unfounded crap. I am using Royal Purple 80w90, and it is DEElicious.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

blargonator · Joined: 22 Sep 2004 Posts: 100 Location: kalamazoo MI

try and get your hands on some GM syncromesh or pennzoil sycnromesh. liquid gold that stuff is.
all the DSM guys (you know, eagle talons, mitsubishi eclipse, plymouth laser) run it, plain jane DSM trannies are utter trash, my brother used to have one and it was basically impossible to not grind 2nd. filled that puppy up with some syncromesh and wualah.

if that doesn't float your boat i too have heard some good things about redline's gear oils.

RonDwyer82-931 · Joined: 10 Sep 2007 Posts: 35 Location: San Leandro, Ca.

I heard the best reason not to re-engineer the lubricants of a sealed gearbox from accomplished racer and engine builder Steve Dinan. Think about it, a gear box is designed to maintain tooth clearances as a result of the resistans of the oil to be squeezed out of tight spaces. Think about your ring gear. Now take out the old stuff and put in something thinner and 2 things happen: first your seals start to leak all over and second your gear clearances all change for the worst. Clean oil is still my favorite any day. If it came from the factory with it, that is what it likes to stay with I have found.
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82 931 mostly new

vexed73 · Joined: 05 Oct 2007 Posts: 187 Location: EASTERN, nc.

924RACR · Posted: Tue Dec 11, 2007 11:50 pm Post subject:

I've been nothing but happy with Redline in all my cars.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

harnishclan · Joined: 10 Dec 2005 Posts: 30 Location: San Diego

Porsche the factory, exclusively recommends and fills all their vehicles with Mobil1. I have used it in all of my cars (motor and TX) for street and track for years with no problems.
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Current: 81 924T, 82 924T, 87 944, 97 993, 04 Cayenne S.
Past: 83 944, 81 911SC Targa, 86 944.

blargonator · Joined: 22 Sep 2004 Posts: 100 Location: kalamazoo MI