Ford went a little crazy with the sequel naming thing in the 1970s, slapping roman numerals at the end of model names to differentiate the “new and improved” models from the old, outdated original. Or at least, that was the idea.
Movies with a roman numeral at the end of the title rarely turn out to be as good as the original that came before them. Is that equally true for cars? We are fortunately not here to debate the quality of these cars, just the names. We want you, dear readers, to come up with the definitive list of car models that used roman numerals to signify a new or updated iteration.
Difficulty: Somewhere between a II and a III.
How This Works: Read the comments first and don’t post duplicates. Adding photos with standard HTML is good, but shrink the big ones with width="500".
Image Sources: oldcarmanualproject.com, paintref.com
By Peter Tanshanomi
Tanshanomi is Japanese [単車のみ] for "motorcycle(s) only." Though primarily tasked with creating two-wheel oriented content for Hooniverse, Pete is a lover of all sorts of motorized vehicles.
Robert Crespo 
Jeff Glucker 
Kamil Kaluski
Low hanging fruit: Lincoln Continental / Mark series, I through VIII.
A sequel so nice they used it twice! Or three times?
Continental Mark II, 1956-1957; by Continental Division of Ford Motor Company
Continental Mark III, 1958; wore no Lincoln badge
Continental Mark IV, 1959; ditto
Continental Mark V, 1960; ditto
Lincoln Continental Mark III, 1969-1971
Lincoln Continental Mark IV, 1972-1976
Lincoln Continental Mark V, 1977-1979
testing login foolishness
Duh.
<img src="http://upload.wikimedia.org/wikipedia/commons/5/5a/Ford_Bronco_II.jpg"width=500>
More low hanging fruit.
<img src="http://image.motortrend.com/f/classic/roadtests/1301_1976_chevrolet_cosworth_vega_vs_mercury_capri_ii/49073652/1976-mercury-capri-ii-taillight.jpg" width="500">
Low hanging fruit: Evo I – X
<img src="http://images.caradisiac.com/images/4/4/9/7/14497/S0-Mitsubishi-Lancer-Evolution-IX-MR-FQ-360-la-der-des-ders-66417.jpg" width="500">
And let's not forget that the GC8 STIs also came in numerous versions
<img src="http://i651.photobucket.com/albums/uu234/DoktorHachiRoku/Subaru/SubaruImprezaSedanWRXSTiVersionVIGC.jpg" width=500 />
Rolls Royce Phantom, Phantom II-VI
Rolls Royce Silver Wraith, Silver Wraith II
Rolls Royce Corniche, II-IV
Bentley Mark series (I-VI)
US Spec Mk3 Jetta was called a Jetta III.
<img src="http://www.switch-happy-euro.co.uk/storev2/timthumb.php?zc=2&q=100&w=178&h=192&src=../userfiles/10291/products/Product_453655.jpg">
Here's a Corona Mark II
<img src="http://upload.wikimedia.org/wikipedia/commons/5/5a/CORONA_MARK2_1ST.jpg" width="500">
And here's the Mark X which may suggest it's 5x better
<img src="http://www.autoguide.com/blog/wp-content/uploads//2012/09/toyota-mark-x-sedan-main.jpg" width="500">
Yep, the last Mark II in 2004 was the 9th generation.
Oddly the "Mark II" Corona became a model in its own right, simply known as the "Mark II", a sister car to the Chaser and Cressida and much loved of drifters. It was made across several generations right up to 2007. It must get confusting looking for parts
"I'd like an oil filter for a MKII Mk4"
"wut?"
http://en.wikipedia.org/wiki/Toyota_Mark_II
Jaguar Mark 2.
<img src="http://upload.wikimedia.org/wikipedia/commons/c/cd/Jaguar.3point4.750pix.jpg" width="400">
<img src="http://www.autopartsdb.net/assets/images/ProductImg/C/CM3070.JPG" width="500">
It's like Coke by CocaCola.
Chrysler australia had this briliant idea before Ferarri :
http://en.wikipedia.org/wiki/Chrysler_by_Chrysler
<img src="http://blog.codinghorror.com/content/images/uploads/2008/06/6a0120a85dcdae970b01287770508e970c-pi.png">
<img src="http://f.kolesa.kz/content/drive_2006/200504/hyundai_sonata_iii/2.jpg" width="500">
In some markets Hyundai numbered the Sonata iterations, like the Sonata III above, and then they stopped doing that.
Can we do concept cars? Firebird I II & III
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/General_Motors_exhibit_at_Century_21_Exposition%2C_1962.jpg/600px-General_Motors_exhibit_at_Century_21_Exposition%2C_1962.jpg">
I didn't really think about concept cars, but since I didn't specify production cars, why not? Any excuse to mention the Firebirds is cool.
Along the same line of thinking, Ford Probe and Olds Aerotech concepts were also numbered.
<img src="http://www.wallpaperup.com/uploads/wallpapers/2014/05/09/350361/big_thumb_77779ea798208fd12a75eea280908899.jpg" width="500">
<img src="http://img.favcars.com/oldsmobile/aerotech/oldsmobile_aerotech_1989_photos_1_b.jpg" width="500">
<img src="http://gomotors.net/pics/Nissan/nissan-terrano-ii-03.jpg?i" width="500">
I kind of want a Terrano II, as an aside.
Honda City Turbo II
<img src="https://41.media.tumblr.com/87e066f99b2b1b3d48792f40fad06dc8/tumblr_n7r00iSMPY1sdvi56o1_500.jpg">
CERV Concept vehicles (following precedent of the previous concept Firebirds)
I.
<img src="https://history.gmheritagecenter.com/wiki/uploads/7/70/C954-0001.jpg" width=500>
II.
<img src="https://history.gmheritagecenter.com/wiki/uploads/2/2b/DN248-CE-8638-0001.jpg" width=500>
III.
<img src="https://history.gmheritagecenter.com/wiki/uploads/c/ce/74738.jpg" width=500>
IV(b).
<img src="http://c564296.r96.cf2.rackcdn.com/Articles/2011/09/16/04.jpg" width=500>
Toyota Fun Runner II ('90s JDM 4Runner)
Since concepts are fair game, how about kit cars?
<img src="http://priceofhistoys.com/wp-content/uploads/2009/01/bradley-gt-ii-51.jpg" width="500/">
Mercedes-Benz W201 190E 2.5-16 Evolution I
<img src="http://i153.photobucket.com/albums/s211/robinbien/190E%20EVO1/M17.jpg" width="500/">
And the Mercedes-Benz W201 190E 2.5-16 Evolution II
<img src="http://www.autowallpaper.de/Wallpaper/Mercedes/Mercedes_Benz_190E_Evolution_2/bilder/MB_190E_2.5_Evolution_2_4.jpg" width="500/">
NSU Prinz I through IV.
<img src="http://www.nsuprinz.com/Models/Images/nsu_prinz_4_5.jpg">
The IH Scout series had a few methods of denoting an update:
Scout 80 – Scout 800 / 800A / 800B – Scout II – Scout III [cancelled]
The 800's sequence is similar to how many off-highway equipment manufacturers designate updates. Some examples in articulated wheel loaders of a certain size range that were updated in the last few years: Case 621E became 621F, Deere 544J became 544K, Cat 924H skipped I/J and became 924K, etc…
I don't' feel bad posting this one myself, since I'm going fairly far afield — Honda's Express II no-ped.
<img src="http://www.mopedarmy.com/img/gallery/moped_e1b20a554a3df8608299a8018db75fb8.jpg" width="500">
The answer that isn't. Fury I, II, and III. Sequil model names used as trim levels.
Chrysler just can't resist being a little strange.
Lotus 1-125. Many of these got names too and many were race cars or other projects (bicycles, soap box derby car, etc. )
On that note, Porsche would vaguely count too, right? I mean, at some point, the numbers vaguely refer to engineering projects as well, sort of, at least until they give up, or Peugeot interferes.
It seems that the Quattroporte II was the only one to be badged with Roman Numerals, but everyone refers to the six generations by them.
<img src="http://www.motorleaseexchange.com/Photos/FoS2010/MaseratiQuattroporte_Rear.jpg" width="400">
Discovery II?
<img src="http://upload.wikimedia.org/wikipedia/commons/1/13/LandRover-Discovery.jpg"width=500>
Panther Solo II.
<img src="http://upload.wikimedia.org/wikipedia/commons/e/e1/Myredsolo.jpg">
Alternating SAAB Sonetts from the chronological sequence Super Sport, II, V4, and III.
<img src="http://saabnet.com/tsn/models/1956SS/photosm.jpg" width="200">
<img src="http://saabnet.com/tsn/models/1966-6797.jpg" width="200">
<img src="http://saabnet.com/tsn/models/1967-6997.jpg" width="200">
<img src="http://saabnet.com/tsn/models/1970-7497.jpg" width="200">
600, 750, Daffodil, 31, 32, 33, 44, 55, 66, 77 (343). Yup, those Van Doorne boys sure could have done with some arithmetic training!
The Ford Cortina Mark II
<img src="http://upload.wikimedia.org/wikipedia/commons/3/34/Ford_Cortina_MkII_1600E_-_Flickr_-_exfordy.jpg" width="600">
The Chaparral 2 Series
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/36/BonnierChaparral1966-06-03.jpg/800px-BonnierChaparral1966-06-03.jpg" width="500">
Elva Mark II through VIII (I think)
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Elva_BMW_Mallory_Park.JPG/1280px-Elva_BMW_Mallory_Park.JPG" width="500">
Here's some more I just thought of:
Mini Mark II
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Morris_Cooper%2C_1969.jpg/800px-Morris_Cooper%2C_1969.jpg" width="500">
Austin Healey Sprite Mark II
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/1963_Austin_Healey_Sprite_MK_II.jpg/800px-1963_Austin_Healey_Sprite_MK_II.jpg" width="500">
<img src="http://files.conceptcarz.com/img/Jaguar/59-Jaguar_MK_IX_DV_08_BC_01.jpg" width="500">
Jaguar Mk IX
Chevrolet Citation II which is just what they called the Citation for the last couple of years of its run. Very few changes. Just an attempt to distance it with the negative press it received upon its introduction and many subsequent recalls.
<img src="http://images1.americanlisted.com/nlarge/1984-chevrolet-citation-ii-americanlisted_23091855.jpg" width="600">
GM II never really saw the light of the day.
Toyota Mark II.
<img src="http://upload.wikimedia.org/wikipedia/commons/3/34/Toyota_Mark2_1988_grande.jpg" width=500>
Always called Mark II despite lasting for nine generations from '68 to '04 ('07 if you include the wagon).
The one in the photo has the A/C controls concealed in an electrically retractable drawer. Just because.
http://imganuncios.mitula.net/1979_international_…
img src="https://imganuncios.mitula.net/1979_international_scout_ii_rallye_100992080024225284.jpg" width=500>
try that again …
Courtesy embed.
<img src="http://imganuncios.mitula.net/1979_international_scout_ii_rallye_100992080024225284.jpg" width="500">
…even though the Scout II has already been mentioned.
For a brief spell in the mid '80's, a friend's father owned the Daroo II …
<img src="http://www.carstyling.ru/resources/concept/large/1970_Dodge_Daroo-II_1969_Daroo-I.jpg"width=500>
Brazilian edition
<img src="http://4.bp.blogspot.com/-L04jauIgf7Y/UE57nTeVM8I/AAAAAAAAAkQ/EwE7PhDKzBg/s1600/ford c.jpg" width="550">
From the lede…
Anyone else remember Mustang II, Boredom Zero?
More Saab goodness: 96, 99, 90 (which came between the 99 & 900), 900, 9000, 9-5.
That'd only count if there were 89 earlier versions. Those are just made up numbers.
Like Leonard Part 6
A decade's worth of sequels in the Chrysler 300 Letter Series.
Following the 1955 C-300, 1956 had the 300B
<img src="http://i.imgur.com/QvOuIPb.jpg">
Incrementing by one letter per year until 1965's 300L
<img src="http://i.imgur.com/C1Co8i8.jpg">
After the Renault 5 Turbo came the 5 Turbo 2, which used more parts from the standard 5 and fewer exotic materials to help bring down the price.
<img src="http://s.petrolicious.com/2013/history/renault/renault-5-turbo-10.jpg" width="600" />
Just about every Rootes Group model came in at least I and II versions, going up as high as VIII in the case of the Hillman Minx.
They were a bit inconsistent though, sometimes using Roman numerals, sometimes using Arabic. Sometimes it was Mark n and sometimes it was Series n. Sometimes the number sequence would start over again when an all new model used an existing nameplate.
<img src="http://www.simoncars.co.uk/simca/slides/t_Simca%20Rallye%202%20side.jpg" width=500>
I had written an email to Tanshanomi a couple weeks ago proposing this very topic. Then I didn't send it.
Anyway, a lot still on the table.
Show car Mako Shark II
<img src="http://assets.blog.hemmings.com/wp-content/uploads//2014/02/Mako-Shark-II-Open.jpg" width=500>
Dodge Charger II
<img src="http://www.autoweteran.gower.pl/concept/1968_Dodge_Charger_III.jpg" width=500>
AMX II
<img src="http://www.autoweteran.gower.pl/concept/1969_American_Motors_AMX_II.jpg" width=500>
Plymouth Duster I
<img src="http://www.autoweteran.gower.pl/concept/1969_Plymouth_Duster.jpg" width=500>
Cadillac LaSalle II
<img src="http://www.autoweteran.gower.pl/concept/1955_Cadillac_La_Salle_II.jpg" width=500>
Dodge Firearrow Roadster II
<img src="http://www.autoweteran.gower.pl/concept/1954_Dodge_Firearrow_II_Ghia.jpg" width=500>
De Soto Adventurer II
<img src="http://www.autoweteran.gower.pl/concept/1954_DeSoto_Adventurer_II.jpg" width=500>
Pontiac Banshee II
<img src="http://www.carstyling.ru/resources/concept/large/1969_Pontiac_Fiero_01.jpg" width=500>
$kay must be on vacation. GT40 MK I, II, III, and IV
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Ford_GT40_Mk_IV.jpg/1280px-Ford_GT40_Mk_IV.jpg" width=500>
Cyclone Spoiler II
<img src="https://img.mecum.com/auctions/FL0115/FL0115-203027/images/FL0115-203027_1.jpg" width=500>
Lancia Delta Integrale Evoluzione II
<img src="http://bringatrailer.com/wp-content/plugins/PostviaEmail/images/1993_Lancia_Delta_Integrale_For_Sale_in_Canada_resize.jpg">
How about a double? Shelby GLHS.
<img src="https://s-media-cache-ak0.pinimg.com/736x/0e/7f/65/0e7f65148d6fba920ee2da528a208a41.jpg" width=500>
Granted, it didn't have a roman numeral in the name. It had something better. As the followup to the Omni GLH (Goes Like Hell), it got the moniker GLHS, for "Goes Like Hell Somemore".
And the double? Under the hood was a prototype 2.2 Turbo II. Later turbo Mopars went on to include Turbo III and Turbo IV engines.
Edsel
<img src="http://upload.wikimedia.org/wikipedia/commons/e/ea/1958_Edsel_Roundup_(Front_View).jpg" width=500>
Edsel II
<img src="http://www.theautochannel.com/news/2005/02/16/033581.1-lg.jpg">
<img src="https://c1.staticflickr.com/5/4142/4756296311_7f94c21668.jpg">
At least in the US, first the the Trooper II, then the Trooper. Can't wait for Trooper 0!
Some of my first licensed driving was in a fairly new 86 II. It was gutless, but to this day one of the lightest greenhouses of any car I've been in.
I see Intense Debate is still disappearing comments.
Jeep just added the word "Grand"
<img src="http://ep.yimg.com/ty/cdn/yhst-33652407708730/xjzj.png">
If letters count …
Commodore :
1 First generation
1.1 VB (1978–1980)
1.2 VC (1980–1981)
1.3 VH (1981–1984)
1.4 VK (1984–1986)
1.5 VL (1986–1988)
2 Second generation
2.1 VN (1988–1991)
2.2 VP (1991–1993)
2.3 VR (1993–1995)
2.4 VS (1995–1997)
3 Third generation
3.1 VT (1997–2000)
3.2 VX (2000–2002)
3.3 VY (2002–2004)
3.4 VZ (2004–2006)
4 Fourth generation
4.1 VE (2006–2013)
4.2 VF (2013–prese
Falcon :
1 First generation (1960–1966)
1.1 XK
1.2 XL
1.3 XM
1.4 XP
2 Second generation (1966–1972)
2.1 XR
2.2 XT
2.3 XW
2.4 XY
3 Third generation (1972–1979)
3.1 XA
3.2 XB
3.3 XC
4 Fourth generation (1979–1988)
4.1 XD
4.2 XE
4.3 XF
4.4 XG
4.5 XH
5 Fifth generation (1988–1998)
5.1 EA
5.2 EB
5.3 ED
5.4 EF
5.5 EL
6 Sixth generation (1998–2010)
6.1 AU
6.2 BA
6.3 BF
7 Seventh generation (2008–present)
7.1 FG
7.2 FG X
Does the entire Peugeot line up count?
104-108
201-208
301-309
401-407
503-508
604-607
Really? Nobody's posted and RX-7 Turbo II yet?
<img src="http://japanesenostalgiccar.com/wordpress/wp-content/uploads/2013/06/1987-Mazda-RX-7-Turbo-II-08.jpg">