• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Is Motorcraft Mercon V a good substitute for plain Mercon, can;t fine just Mercon for transmission?


Josh B

Well-Known Member
Supporting Member
TRS 20th Anniversary
Joined
Aug 15, 2019
Messages
3,886
Reaction score
1,907
Points
113
Location
Oklahoma
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
Thanks :) I thought I recognized that name, Crescent City. I worked in Ocala circa 1975, 76, was a traveling picture show (family pictures fellas!) had a gf in Gainesville, spent a few weekends in St Pete, loved it down there man :)
 


4x4junkie

Forum Staff Member
TRS Forum Moderator
TRS 20th Anniversary
Joined
Aug 19, 2001
Messages
10,736
Reaction score
566
Points
113
Location
So. Calif (SFV)
Vehicle Year
1990
Make / Model
Bronco II
Engine Type
2.9 V6
Engine Size
2.9L V6
Transmission
Manual
2WD / 4WD
4WD
Tire Size
35x12.50R15
Mercon V is full synthetic Mercon and is backwards compatible with Mercon, and the old Ford type CJ. When full synthetic Mercon came out it was labeled as such, at some point Ford started labeling it as MerconV. Ford type F and Mercon LV and SP are different.
That is what Ford wants you to believe. While it appears to be true for automatics, it has very often not been the case with manuals.
 

sgtsandman

Aircraft Fuel Tank Diver
TRS Forum Moderator
U.S. Military - Active
TRS 20th Anniversary
TRS Event Participant
Ham Radio Operator
GMRS Radio License
Joined
Mar 11, 2017
Messages
12,451
Reaction score
12,032
Points
113
Location
Aliquippa, PA
Vehicle Year
2011/2019
Make / Model
Ranger XLT/FX4
Engine Size
4.0 SOHC/2.3 Ecoboost
2WD / 4WD
4WD
Total Lift
Pre-2008 lift/Stock
Tire Size
31X10.5R15/265/65R17
While anecdotal and and sample size of one, the fluid used in my 2011 transmission makes a difference. The aftermarket version of Mercon V doesn’t shift as well or last as long as the actual Mercon V. Granted, I’ve only used one or two products. Castrol is one and shifting got stiff, especially going into reverse, after a few months. Something that hasn’t been an issue with Motorcraft Mercon V.
 

bcschief

Member
Joined
Dec 7, 2013
Messages
87
Reaction score
31
Points
18
Location
crescent city fl
Vehicle Year
1986
Make / Model
Ford
Engine Size
2.9
Transmission
Manual
I personally don't like synthetics I prefer Dino oils as I am not a fan of extended service intervals. In manual gear boxes the difference is synchronizer material. The Toyo Koyo and the Mitsubishi boxes have brass syncro's and the Mazda's have lining material in them which is why the spec Mercon or Mercon V and why the older transmissions spec 80w90 oil. Not sure what any of the newer transmission use because I don't work as a mechanic anymore.
 

bcschief

Member
Joined
Dec 7, 2013
Messages
87
Reaction score
31
Points
18
Location
crescent city fl
Vehicle Year
1986
Make / Model
Ford
Engine Size
2.9
Transmission
Manual
Thanks :) I thought I recognized that name, Crescent City. I worked in Ocala circa 1975, 76, was a traveling picture show (family pictures fellas!) had a gf in Gainesville, spent a few weekends in St Pete, loved it down there man :)
Born and raised in Orlando and I would not care to live there now, moved out here in 07. Florida has a much larger population now.
 

Shran

Junk Collector
TRS Forum Moderator
Supporting Member
Article Contributor
V8 Engine Swap
Solid Axle Swap
Joined
Mar 4, 2008
Messages
8,511
Reaction score
4,499
Points
113
Location
Rapid City SD
Engine Type
V8
Engine Size
5.0
I personally don't like synthetics I prefer Dino oils as I am not a fan of extended service intervals. In manual gear boxes the difference is synchronizer material. The Toyo Koyo and the Mitsubishi boxes have brass syncro's and the Mazda's have lining material in them which is why the spec Mercon or Mercon V and why the older transmissions spec 80w90 oil. Not sure what any of the newer transmission use because I don't work as a mechanic anymore.
No... the syncro rings in all of the Ranger manual transmissions are brass (or bronze, not sure, yellow metal either way.) Mazda M5ODs do not have any lining materials, they are literally the same design as the others - a bronze ring that rides on a iron cone. 80w90 gear oil is not appropriate for any of them at least in the common GL5 formula. GL4 is safe for Mitsubishi transmissions but good luck finding it in multi viscosity. I have only found straight 80w and it is AWFUL in cold weather.

Valvoline or Pennzoil Syncromesh MTF, Royal Purple Syncromax, Redline MTF are good in all temperatures in all of the Ranger manual transmissions. I really like it in the Mitsubishi ones. I would not use anything else in those except maybe heavier weight engine oil in a pinch. IMO a heavier oil in these is not a bad thing because it can stay in the ball bearings longer & lube them better (as opposed to roller bearings in the M5OD) but there is a point where the oil is too heavy and can make shifting really stiff/notchy.

Dex/Merc II/III or 5w-30 synthetic engine oil for M5ODs. I have also run 10w40 conventional oil in M5ODs before to help with worn syncros in hot weather and it helped but had the opposite in cold weather.

Just my experience messing with a lot of different fluids over a lot of miles in various trucks - I am not an engineer nor a professional mechanic but I have rebuilt a bunch of manual transmissions and have a good idea what they prefer for oil.
 

Sponsored Ad


Sponsored Ad

Staff online

Members online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Yotaismygame
February Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top