The Perennial ATF Question - Diesel Forum - TheDieselStop.com
1999-2007 Gas Engines Discussion of the gas engines available in the 1999-2007 Super Duty trucks

 
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post #1 of 5 (permalink) Old 11-16-2019, 06:59 PM Thread Starter
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The Perennial ATF Question

I look after our kids' motorhome here at the campsite, and today as I was putting it up for the winter I noticed the tranny is low on ATF.

The chassis if a 1999 F-550 V10 Triton gasser. Is probably running the original ATF as it is low mileage.

AutoZone lists Valvoline MaxLife Dex/Merc Automatic Transmission Fluid for this vehicle. (I entered the VIN to get their applicable products.)

Has the perennial agonizing over Mercon vs Mercon V finally gone away and I can assume that reputable parts suppliers sell the proper oil? (We're out in the brush here. Nearest Ford dealer is farther that I feel like driving unless this post blows up and I can't decide on the local supplier?)

Thanks in advance! (Still driving my 2000 PSD. Gonna be buried in it!)

Art

2000 F350 7.3 PSD 4x4 six-pack dually. All Stock.
Ride Rites with "Big Red" on-board Compressor.
DynaTrac Free-Spin conversion.
Hellroaring Battery Isolator for T-145 house batteries.
Flex-A-Lite 900 CFM tranny cooler (for those special 100 Deg./5 MPH-traffic
Florida days) with Magnefine filter.
FleetGuard coolant filter.
Sun-Lite slide-in camper.
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post #2 of 5 (permalink) Old 11-16-2019, 08:09 PM
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I trust Autozone as far as I can throw one of their buildings.

Having said that, what they recommend won't hurt it. It isn't the best choice, but it's not bad for it. MERCON V is the correct fluid for that transmission.

Mark
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post #3 of 5 (permalink) Old 11-16-2019, 11:49 PM
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Here's one available at Autozone that should work well for you. Mobil 1 Mercon V.

https://www.autozone.com/motor-oil-a...quart/5042_0_0

2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.

2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
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post #4 of 5 (permalink) Old 11-18-2019, 07:44 PM Thread Starter
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ATF

Thanks to both! I don't log on much since I quit towing, so was glad to see you're still on there.

Seems like there was a lot of controversy swirling around Mercon V 15 years ago, and apparently it's not the poison for old 4R100s like some thought it was when I first got the truck.

Interestingly, the motorhome has the same tranny with the Triton engine as my 7.3 which has served me well.

I haven't looked for any junk in my truck's internal screen, but the Magnefines are clean when I change ATF. I use Amsoil Torque Drive. Performance is exactly as it was when new.

You guys OK with adding synthetic to whatever mouse milk Ford put in that tranny at the factory? I'll go with the Mobil-1 Synthetic.

Thanks again. Good to hear from you.
Art, Formerly Known As "ShePointiIDig."

2000 F350 7.3 PSD 4x4 six-pack dually. All Stock.
Ride Rites with "Big Red" on-board Compressor.
DynaTrac Free-Spin conversion.
Hellroaring Battery Isolator for T-145 house batteries.
Flex-A-Lite 900 CFM tranny cooler (for those special 100 Deg./5 MPH-traffic
Florida days) with Magnefine filter.
FleetGuard coolant filter.
Sun-Lite slide-in camper.
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post #5 of 5 (permalink) Old 11-18-2019, 08:09 PM
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Quote:
Originally Posted by artkelly View Post
Seems like there was a lot of controversy swirling around Mercon V 15 years ago, and apparently it's not the poison for old 4R100s like some thought it was when I first got the truck.
Back then MERCON V was poison to 4R100s. In 2006 MERCON V was changed to be compatible with 4R100s.

Quote:
Originally Posted by artkelly View Post
Interestingly, the motorhome has the same tranny with the Triton engine as my 7.3 which has served me well.
Both are 4R100s, but there are differences between the diesel and gas versions.

Quote:
Originally Posted by artkelly View Post
You guys OK with adding synthetic to whatever mouse milk Ford put in that tranny at the factory? I'll go with the Mobil-1 Synthetic.
Yes, they are compatible and will mix without problems.

Mark
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