Motor oil (10-30w) in your transmission, whos done it/heard of it? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

apexi240sx · 02-20-2007, 11:46 PM

i just got my tranny rebuilt and the shop says to use 30 wieght motor oil in it? dosent that mess up the synchros in your tranny?

too thin? another sr20 shop told me as well that using motor oil in your gear box is cool too (wont mess it up).. dosent the factory manual call for 75-90w for sr/ka manual gearboxes? anyone using 10-30w motor oil in their gearbox?

smurfgcr · 02-20-2007, 11:49 PM

uhh. i put gear oil in my tranny. its atf if it auto

UNITEDMASTER · 02-20-2007, 11:54 PM

Hello ,I run a blend of 120wt gear oil and 30wt motor oil. Works good for me ,car is DD & Tracked !!!

nrg · 02-21-2007, 01:56 AM

actually for a rebuilt tranny, you're supposd to run 10w-30 in your tranny for ~500 miles, then switch to gear oil.

harlockssx · 02-21-2007, 06:49 AM

I've done it before (after a rebuild) with my Mustang...its factory fluid is actually ATF, so the 30W oil "should" have better properties, however I did switch back to factory recommended after 5K & put another 100K+ on it...

McRussellPants · 02-21-2007, 10:15 AM

10-30 is the same viscosity as 75-90 gear oil

The DA guys do it, so obviously Zilvia will need to do it in 6 months.

drift freaq · 02-21-2007, 11:47 AM

Been doing it for years, found out about it back in 2001 from a friend at a tranny shop. Lots of racers have done it for years. Much smoother shifts.

PoorMans180SX · 02-21-2007, 02:06 PM

Wow, why isn't this info anywhere? So 10w-30 is the best viscosity to run? There's 10w40 and 10w50 and all that.

If they're the same viscosity, why is gear oil so thick? That doesn't make sense to me. Someone please explain. I love new info.

apexi240sx · 02-21-2007, 02:14 PM

alotta mixed reponses! well ima go ahead and run 10-30w on it anyways..its under warranty and that the recommended oil that was written on the invoice

Matej · 02-21-2007, 02:18 PM

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PoorMans180SX · 02-21-2007, 03:57 PM

What about running some Greddy 10w60?

02-20-2007, 11:46 PM	#1
apexi240sx Zilvia Member Join Date: Sep 2004 Location: Las Vegas, NV, San Fernando Valley, CA Age: 43 Posts: 255 Trader Rating: (0) Feedback Score: 0 reviews	Motor oil (10-30w) in your transmission, whos done it/heard of it? i just got my tranny rebuilt and the shop says to use 30 wieght motor oil in it? dosent that mess up the synchros in your tranny? too thin? another sr20 shop told me as well that using motor oil in your gear box is cool too (wont mess it up).. dosent the factory manual call for 75-90w for sr/ka manual gearboxes? anyone using 10-30w motor oil in their gearbox?

02-20-2007, 11:54 PM	#3
UNITEDMASTER Nissanaholic! Join Date: Apr 2006 Location: Anaheim Posts: 1,626 Trader Rating: (10) Feedback Score: 10 reviews	Hello ,I run a blend of 120wt gear oil and 30wt motor oil. Works good for me ,car is DD & Tracked !!! __________________ MR JACKSON.

02-21-2007, 01:56 AM	#4
nrg Zilvia FREAK! Join Date: Mar 2004 Location: CA Age: 40 Posts: 1,571 Trader Rating: (1) Feedback Score: 1 reviews	actually for a rebuilt tranny, you're supposd to run 10w-30 in your tranny for ~500 miles, then switch to gear oil. __________________ driftingisgay.com

02-21-2007, 06:49 AM	#5
harlockssx Zilvia Junkie Join Date: Nov 2005 Location: APO AP 96367 Age: 52 Posts: 463 Trader Rating: (19) Feedback Score: 19 reviews	I've done it before (after a rebuild) with my Mustang...its factory fluid is actually ATF, so the 30W oil "should" have better properties, however I did switch back to factory recommended after 5K & put another 100K+ on it... __________________ Old School

02-21-2007, 11:47 AM	#7
drift freaq R.I.P. Aya, always love Join Date: Nov 2001 Location: Los Feliz/Hollywood Posts: 18,564 Trader Rating: (215) Rides Gallery: drift freaq Feedback Score: 215 reviews	Been doing it for years, found out about it back in 2001 from a friend at a tranny shop. Lots of racers have done it for years. Much smoother shifts. __________________ "Having a lot of tracks on a song is like putting stickers on a car to get more horsepower" New Video https://www.youtube.com/watch?v=uebV1OnbRsw Buy my mounts! http://zilvia.net/f/sale-items/51531...ns-mounts.html http://zilvia.net/f/tech-talk/317539...e-mouts-6.html

02-20-2007, 11:49 PM	#2
smurfgcr Zilvia Member Join Date: Jul 2005 Location: santa rosa, ca Posts: 152 Trader Rating: (0) Feedback Score: 0 reviews	uhh. i put gear oil in my tranny. its atf if it auto

02-21-2007, 10:15 AM	#6
McRussellPants Nissanaholic! Join Date: Oct 2005 Location: Austin, Tx Posts: 2,168 Trader Rating: (0) Feedback Score: 0 reviews	10-30 is the same viscosity as 75-90 gear oil The DA guys do it, so obviously Zilvia will need to do it in 6 months.

02-21-2007, 02:06 PM	#8
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 37 Posts: 5,616 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	Wow, why isn't this info anywhere? So 10w-30 is the best viscosity to run? There's 10w40 and 10w50 and all that. If they're the same viscosity, why is gear oil so thick? That doesn't make sense to me. Someone please explain. I love new info. __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs.

02-21-2007, 02:14 PM	#9
apexi240sx Zilvia Member Join Date: Sep 2004 Location: Las Vegas, NV, San Fernando Valley, CA Age: 43 Posts: 255 Trader Rating: (0) Feedback Score: 0 reviews	alotta mixed reponses! well ima go ahead and run 10-30w on it anyways..its under warranty and that the recommended oil that was written on the invoice

02-21-2007, 02:18 PM	#10
Matej Post Whore! Join Date: Feb 2007 Location: N/A Posts: 9,423 Trader Rating: (39) Feedback Score: 39 reviews	---------- Last edited by Matej; 07-09-2020 at 01:04 AM..

02-21-2007, 03:57 PM	#11
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 37 Posts: 5,616 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	What about running some Greddy 10w60? __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs.