synthetic tranny fluid at 120k a good idea?

Nolan · 12-12-2004, 10:05 AM

I have a 1996 4Runner with 120k on it. I am going to be changing the tranny fluid and I want to use the Redline MT-90 which is synthetic. Should I have any concern about using synthetic on my high mileage truck? I have mainly heard in regards to engine oil that the synthetic oil has a tendancy to find weak spots in seals due to its finner properties. Does that also go for tranny fluid? Currently I have no leaks on my truck.

jimbo74 · 12-12-2004, 10:26 AM

its fine.... my truck probably has around 200k+ miles, and when i can afford it, im going to be using GM synchromesh in the tranny

84runner · 12-12-2004, 05:26 PM

good .

Use it, just check the fluid level in a few weeks. You shouldn't regret it.

turboale · 12-12-2004, 10:05 PM

Yeah, I use BG full synth in my tranny. Thing works like a dream (and I'm hard on my poor truck).

4Runner4Christ · 12-13-2004, 07:27 AM

If your engine has been properly maintained and has no signs of leaks you can start using synthetics. I would suggest Amsoil XL7500 after doing the Amsoil engine flush thing.

Nolan · 12-13-2004, 07:31 AM

Are you refering to engine oil or tranny fluid? I think as far as engine oil goes I am not balsy enough to switch just because dino has been working and I think I will stick with it. But as far as the transmission and differential, I would like to get those on synthetics.

Quote:

Originally Posted by 4Runner4Christ

If your engine has been properly maintained and has no signs of leaks you can start using synthetics. I would suggest Amsoil XL7500 after doing the Amsoil engine flush thing.

FilthyRich · 12-13-2004, 07:39 AM

if your truck has a bunch of miles, synthetic engine oil can only benefit you. IMO. I run Amsoil synthetic everything and I have 97k miles.

FilthyRich · 12-13-2004, 07:41 AM

Quote:

Originally Posted by FilthyRich

if your truck has a bunch of miles, synthetic engine oil can only benefit you. IMO. I run Amsoil synthetic everything and I have 97k miles.

...you said 120k...my bad

Nic · 12-13-2004, 04:25 PM

Nolan, I swithced over to Amsoil for my transmission and diffs/t-case when I bought my truck. Still using dino for the engine. It had 110,000 miles on it when I bought it. I have not had any problems.

I did, however, drain the Amsoil from the transmission and switch over to the Redline MT-90 since my shifting was not that great with the Amsoil. I have been pretty happy with the Redline in the transmission and I guess the Amsoil is doing OK in the diffs and transfer case.

12-12-2004, 10:05 AM	#1 (permalink)
Nolan Registered User Join Date: Oct 2002 Location: San Diego Posts: 336	synthetic tranny fluid at 120k a good idea? I have a 1996 4Runner with 120k on it. I am going to be changing the tranny fluid and I want to use the Redline MT-90 which is synthetic. Should I have any concern about using synthetic on my high mileage truck? I have mainly heard in regards to engine oil that the synthetic oil has a tendancy to find weak spots in seals due to its finner properties. Does that also go for tranny fluid? Currently I have no leaks on my truck. __________________ * 4runner * 2WD 2.7L 5spd * 4.88 Precision Gears * Rear ARB Locker * ARB Compressor * 2.5" front/2" rear CF spacers * 4wd springs * Bilstein shocks * 285/75/16 BFG AT's * 16x8 Ivan Stewart TRD wheels Gibson exhaust Yakima roof rack * Rocky Mounts Bike Rack * Yakima Lift Ticket 6 Snowboard Rack * Amsoil Air filter * deckplate mod * Optima 34R Red Top * 15% front Tint * PreRunner Front mud flaps * PIAA 1400 fog lights * '02 4Runner Sport Skidplate & Tube Steps * Husky Floor Liners *

12-12-2004, 10:05 PM	#4 (permalink)
turboale Contributing Member Join Date: Jun 2002 Location: Savannah, GA Posts: 4,808	Yeah, I use BG full synth in my tranny. Thing works like a dream (and I'm hard on my poor truck). __________________ --Austin 06 M45 Sport - Beauty 96 4Runner - The Beast

12-13-2004, 07:27 AM	#5 (permalink)
4Runner4Christ Registered User Join Date: May 2003 Location: Midwest Posts: 391	If your engine has been properly maintained and has no signs of leaks you can start using synthetics. I would suggest Amsoil XL7500 after doing the Amsoil engine flush thing. __________________ Black 99 4Runner 4WD . Mods: 1" Cornfed lift with LT265-75 AT's, Deckplate mod, Rear Diff Breather mod, 100% Amsoil, FIAMM horn mod, Husky's, '01 taillight mod, & others. 135K Miles, new TimingBelt-H20 Pump-SpPlugs. <>< Got Eternity?

12-13-2004, 04:25 PM	#9 (permalink)
Nic Registered User Join Date: Jan 2004 Location: Decatur, Alabama Posts: 1,042	Nolan, I swithced over to Amsoil for my transmission and diffs/t-case when I bought my truck. Still using dino for the engine. It had 110,000 miles on it when I bought it. I have not had any problems. I did, however, drain the Amsoil from the transmission and switch over to the Redline MT-90 since my shifting was not that great with the Amsoil. I have been pretty happy with the Redline in the transmission and I guess the Amsoil is doing OK in the diffs and transfer case. __________________ Nic 1997 Tacoma 4X4 Xtra Cab 2.7L 5 speed

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12-12-2004, 10:26 AM	#2 (permalink)
jimbo74 Banned Join Date: Jan 2004 Location: Nor*Cal Posts: 6,592	its fine.... my truck probably has around 200k+ miles, and when i can afford it, im going to be using GM synchromesh in the tranny

12-12-2004, 05:26 PM	#3 (permalink)
84runner Registered User Join Date: Nov 2004 Posts: 57	good . Use it, just check the fluid level in a few weeks. You shouldn't regret it.

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