Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Trailer Towing and Tow Vehicles Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 05-16-2006, 07:43 AM   #1
Join Date: May 2006
Posts: 37
Is synthetic fluid in transmission's better than regular transmission fluid.


newfiejeff is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-16-2006, 07:43 AM   #2
Join Date: May 2006
Posts: 37
Is synthetic fluid in transmission's better than regular transmission fluid.


newfiejeff is offline   Reply With Quote
Old 05-16-2006, 09:25 AM   #3
Moderator Emeritus
K-Star's Avatar

Texas Boomers Club
Mid Atlantic Campers
Ford Super Duty Owner
Join Date: Jan 2000
Location: Fulltime - Currently somewhere in the lower 48
Posts: 2,228
in general there are many (myself included) that believe Synthetic is better. You weren't real specific in your question tho regarding what type of vehicle you have, or type of tranny. Heat is what will kill an auto. tranny faster then just about anything else. Heat breaks down the fluid. synthetic can take much more heat before it starts to break down. so in theory synthetic can take more heat than fossil fluid. I believe that is true so I use synthetic wherever I can.

Having said that, you need to look into making sure the synthetic is a compatible replacement for the fossil fluid. The Allison that GM uses has Trans-synd (think that is what they call it) that is a synthetic. But it is made by Allison and they have not release the formula for anyone else to manufacture it. So your really limited to using their fluid. AMSOIL reverse engineered it and sell it in their product line if that is any consolation.

In the case of the `05 and `06 Fords (effects me) there is no other brand to go with except Ford's fluid.

using anything else but a compatible replacement will void your tranny warranty.
John, Joyce & Zoie the Terrier. - Fulltime since 2008

2017 Solitude 375-RES by Grand Design
2018 Ford F-450 King Ranch
K-Star is offline   Reply With Quote
Old 05-16-2006, 09:47 AM   #4
Senior Member
Two Bit's Avatar
Join Date: Feb 2001
Location: Texas hillcountry USA
Posts: 530
Short answer is yes. It tolerates heat better. Main thing is use the correct type for your transmission as specified by your owners manual, regardless of whether it is dino or synthetic.

My transmission (Ford 4R100) requires MERCON and the owners manual states do not use MERCON V. Mobil 1 ATF (a good synthetic) used to be MERCON but is now MERCON/MERCON V. so I dont use it. I use Royal Purple Max ATF synthetic (a MERCON labeled fluid). Synthetic ATF runs $7 or more per quart and I needed five gallons. Considering a new transmission would cost me over $4000, spending around $150 on fluid was worth it. If you are towing, adding a transmission cooler like a "Tru-Cool Max" and a transmission temperature gauge is worth it too. If you have a ford with a factory dash trans temperature gauge, those are no more than idiot lights that only go to "hot" way too late to save your tranny.
Robert & Nancy with "Murphy the EOG"
Murphy has passed on, but Micah and Bogie have assumed the watch! 02 Holiday Rambler 5ver, 2015 Indian Chief Vintage. 98 Coachmen truck camper.
Two Bit is offline   Reply With Quote
Old 05-16-2006, 12:50 PM   #5
Senior Member
JimmyDee's Avatar
Join Date: Apr 2003
Location: W. Michigan
Posts: 133
Two Bit is telling you straight. My study on synthetic oil indicates use of it will allow a full 100 degrees F higher temperature before breaking down. It produces no varnish as it ages and that in its-self is worth the extra money. The longer you let the oil go without changing it, the more important it is that you use synthetic. Its a lot more money but I feel its worth every penny of it.
God Bless America

SPELL CHECK By IeSpell; Its free and it works.
JimmyDee is offline   Reply With Quote
Old 05-17-2006, 04:26 AM   #6
Senior Member
powerboatr's Avatar
Damon Owners Club
Freightliner Owners Club
Join Date: Mar 2006
Location: North East Texas
Posts: 3,742
bob is the oil guy
read here it has everything and then some you ever thought about wanting to know or forget about lubricants
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, no your eyes are fine, there are really 6 slides
2016 Expedition Toad on Hauler flat bed
powerboatr is offline   Reply With Quote
Old 05-19-2006, 08:39 AM   #7
sawtooth's Avatar
Join Date: Apr 2000
Location: WOLF, ID USA
Posts: 30

Not sure if ATF+4 is a full synthetic, but I recently purchased and installed a case of the stuff (Vavoline from a NAPA Store, much less expensive than the MOPAR ATF+4) in a '96 Dodge gasser with 130K miles. No problems making a 360 traveling from Boise to Sacremento, through Yosemite even though tranny temps approached 300 deg F. for short periods. (the tranny temp sensor is mounted between the torque converter output and the radiator cooler).

Dodge transmission TSB's

ATF+4 News
'22 Fleetwood
'96 Ram
sawtooth is offline   Reply With Quote
Old 11-05-2006, 06:50 PM   #8
Join Date: Nov 2006
Location: Elizabeth, Co
Posts: 65
New to the forum.

Just installed myself a Banks Powerpack, Ottomind, transcommand on 2004 Damon Instruder with V-10. Live in Colorado and pull ATV trailer weighing about 3500#.

First trip to nearby ATV location and system worked well particularly the shift points. However, at highway speeds when downshift was needed it works well but on the upshift under acceleration, there was a very brief high pitched noise just before the upshift. Don't know if that is the tranny slipping. Only have 11,000 miles so I'm going to check with banks. May switch to the royal purple but the change out sounds a little complicated.

Bakeryman is offline   Reply With Quote
Old 11-07-2006, 07:20 PM   #9
Senior Member
Ray,IN's Avatar
Join Date: Aug 2001
Location: North America somewhere
Posts: 13,881
Read this thread entitled synthetic oil-isn't, before making a desicion. Read all the linked documentation of the article to confirm the authors veracity.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
Ray,IN is offline   Reply With Quote
Old 04-13-2007, 08:44 AM   #10
Junior Member
Join Date: May 2001
Location: Louisville, KY
Posts: 27
I held off going to synthetic and decided to switch this spring at my mechanic's recommendation with 82,000 miles on the truck. Only one camping trip this year so far, but I can see the trans is running 20 degrees cooler when towing. I also think it shifts a little crisper, especially at higher RPMs (2500-3500).

Change was done with both a pan drop and filter change, followed by a machine flush to get the rest of the dino out and replace with synthetic.

I had been cahnging fluid every spring since the truck was new, but may let the synthetic go two years, we'll see how it performs this summer.

Still running dino oil in the motor, change with the filter every 3K miles.
2001 Suburban 2500 8.1L big block and 4.10 axle
2008 Terry 280FQS Luxury TT
BurbMan is offline   Reply With Quote
Old 02-03-2008, 07:27 AM   #11
Senior Member
blacktie.shooter's Avatar
Fleetwood Owners Club
Join Date: Feb 2008
Location: Vancouver, USA (WA, that is) the first one!
Posts: 302
How about Royal Purple or Mobil 1 in a Ford C6 behind a Ford 7.5L?

I know factory fill in many sumps and crankcases now are synthetic, and an Amsoil rep told me that military jets have been using synthetics for years.
I switched the 7.5L Ford engine to synthetic, and it made a HUGE difference in the temperature increase when climbing the same grade out of the Columbia River Gorge. Synthetic Blend = over 30 degrees. Full synthetic = maybe 4 or 5 degrees!

With that visual proof of what I have been hearing for years, that synthetic dissapates heat faster than fossil, and knowing that HEAT is what kills auto trannies, can anyone tell me why I should NOT switch my C6 to full synthetic? Would like to avoid any little "OOPS" that anyone might know of, peculiar to that particular changeout.

Thanks in advance,
Ken & Carolee, 1994 36' Pace Arrow/Ford 7.5L, Mobil 1 full syn & Banks Pack. Towing a 1999 Saturn SL2 with Roadmaster Sterling All-Terrain & Brake Buddy.
blacktie.shooter is offline   Reply With Quote
Old 02-04-2008, 04:48 AM   #12
Senior Member
Join Date: Feb 2000
Location: SE FL
Posts: 236
There's no reason you can't run synthetic in a C6.

Ford stopped production of MERCON last year, and changed MERCON V to be compatible with all transmissions that used to use MERCON, such as your C6.

I like Mobil 1 synthetic ATF. I have no experience with Royal Purple, but it's probably fine, too.
Former Ford automatic transmission engineer.
Mark Kovalsky is offline   Reply With Quote
Old 02-04-2008, 04:14 PM   #13
Senior Member
blacktie.shooter's Avatar
Fleetwood Owners Club
Join Date: Feb 2008
Location: Vancouver, USA (WA, that is) the first one!
Posts: 302
A response from a Ford auto tranny engineer . . . I love it. What more could I ask for? Thank you very much for responding with that good information.

Ken & Carolee, 1994 36' Pace Arrow/Ford 7.5L, Mobil 1 full syn & Banks Pack. Towing a 1999 Saturn SL2 with Roadmaster Sterling All-Terrain & Brake Buddy.
blacktie.shooter is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Damon Differential Fluid Type (Synthetic)? winston41 Ford Motorhome Chassis Forum 11 10-09-2008 01:59 PM
change transmission fluid, brake fluid, and engine coolant? dirko Winnebago Industries Owner's Forum 10 08-26-2008 03:43 PM
Changing to synthetic trans fluid DannyLong Ford Motorhome Chassis Forum 2 04-22-2007 06:25 PM
Allison Synthetic Tranny Fluid Gary RVRoamer Class A Motorhome Discussions 10 07-20-2006 07:28 PM
How to get all trans fluid out of a 4L85E to change to Synthetic fluid? ChinaUK Workhorse and Chevrolet Chassis Motorhome Forum 6 07-06-2006 05:16 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:54 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.