Solved -PJ586- You were ready for that!

[Paul Jaray]

..and only for you 6 players a special extension of the game:
Post 3 numbers each, between 100 and 103200 and let's see what happens!

Yay! 

3728, 5714 and 8387, please.

3728: MODEL SIX C-60 SEDAN 1922
5714: ROCSTA 4WD 1994
8387: COBRA 427 1985

[Paul Jaray]

Not an obstacle, as long as you can keep posting 
Yes, that Fiandri. They coachbuilt a MASERATI A6 gcs\53 spider around 1953!
+21

Now, since you are the last one you can tell me 5 numbers for your game, I'll tell you the makers and you can take your time to find them...there's no hurry if you want to continue and I know that there's a real life to take care of...(do I?)
...beside that, I think I found a way to keep other players busy, while they wait. 

OK, let's try these then:

#305: ALART
#10600: MORETTE
#11303: ONE SIX TWO
#12062: PONTIAC (1)
#15059: Too close to your 15102

There you are!

[faksta]

Oh..here you are, my great maths abilities 

Let it be #15051 instead

[Paul Jaray]

Oh..here you are, my great maths abilities 

Let it be #15051 instead

TONGBAO

[faksta]

#305 ALART - Alart Coupe, a little French sportscar from 1959. Saw one in the Cite de l'Automobile museum in Mulhouse a couple years back.
#10600 MORETTE - is it a company that manufactures bodykits for cars, mainly dealing with headlamps? Doesn't sound enough to be in your list to me actually, but who knows. They have originated in France, but later seemingly moved elsewhere.
#11303 ONE SIX TWO - I'll use a time range hint here.
#12062 PONTIAC - pretty obviously, an American manufacturer established in 1926, part of GM.
#15051 TONGBAO - Suzuki-based small commercial vehicles. Sounds like they must be Chinese, but all of the sales ads I've seen were from Uruguay for some reason.

[Paul Jaray]

#305 ALART - Alart Coupe, a little French sportscar from 1959. Saw one in the Cite de l'Automobile museum in Mulhouse a couple years back.
#10600 MORETTE - is it a company that manufactures bodykits for cars, mainly dealing with headlamps? Doesn't sound enough to be in your list to me actually, but who knows. They have originated in France, but later seemingly moved elsewhere.
#11303 ONE SIX TWO - I'll use a time range hint here.
#12062 PONTIAC - pretty obviously, an American manufacturer established in 1926, part of GM.
#15051 TONGBAO - Suzuki-based small commercial vehicles. Sounds like they must be Chinese, but all of the sales ads I've seen were from Uruguay for some reason.

#305: Right! (+21)
#10600: Not that but I found out that other sources (all but 1) list that under the builder's name. I'll let you have another try on this.(and I'll fix this bug in my list  )
#11303: apporx 1983-86 (-1)
#12062 not that -3 (it's harmless now to reveal that Pontiac 4 is the GM one  )
#15051 later known as 'ZONGSHEN TONGBAO', right! (+21)

[faksta]

#12062 - Pontiac Spring and Wagon Works?

[Paul Jaray]

#12062 - Pontiac Spring and Wagon Works?

Not that...

[faksta]

#10600 - a Morette three-wheeler built by B.E. Dickinson in 1902?

[faksta]

#12062 - cca 1915, Pontiac Chassis Co.?

[Paul Jaray]

#10600 - a Morette three-wheeler built by B.E. Dickinson in 1902?

Yes!
Burgess-Wise's book is the only that lists it as Morette but in this case I'll fix it.
+22

[Paul Jaray]

#12062 - cca 1915, Pontiac Chassis Co.?

Not that...

[faksta]

#12062 - Pontiac Buggy Company? But in this case I'm not sure at all this fits, as they might have only produced horse-driven carriages, not motor cars.

[faksta]

#12062 - Pontiac Spring and Wagon Works?

This is said to have been renamed as Pontiac Vehicle Company later on...

[Paul Jaray]

#12062 - Pontiac Buggy Company? But in this case I'm not sure at all this fits, as they might have only produced horse-driven carriages, not motor cars.

#12062 - Pontiac Spring and Wagon Works?

This is said to have been renamed as Pontiac Vehicle Company later on...

Not Pontiac Buggy Company and not the Spring Wagon Works (or Vehicle Company).

Remember you have 3 hints, if you like.

Faksta 13 numbers. Scored 143.

7 more numbers to spot a top maker
20 more numbers to score more than 1580.

[pguillem]

..and only for you 6 players a special extension of the game:
Post 3 numbers each, between 100 and 103200 and let's see what happens!

I'm curious!
5219, 80405, 100197

I'm curious too !
1048, 10048, 100048

[targhediferro]

Ok, Let's try:
6017 - 10017 - 15017.

[Wendax]

5219:     10hp 1924
80405:   Mark1 hatchback 1988
100197: Model 18 7-passenger Touring 50hp 1918

100197 hopefully is the 1918 Westcott Model 18.

For the other 2 numbers I need the first hint.

[Otto Puzzell]

3728: MODEL SIX C-60 SEDAN 1922
5714: ROCSTA 4WD 1994
8387: COBRA 427 1985

3728: American Balanced - The American was an American automobile, built in Plainfield, New Jersey, manufactured from 1917 to 1924. The company also used names American Balanced Six or American Six, "Balanced" referred to its chassis, not the engine. It was an assembled car, one of many built in its time, and it used components from several manufacturers like Borg & Beck for clutch, Warner transmission, Stromberg carburetor and Rutenber engines. I can't find a picture of a 1922, but here's a '21.

[Otto Puzzell]

3728: MODEL SIX C-60 SEDAN 1922
5714: ROCSTA 4WD 1994
8387: COBRA 427 1985

5714: The Asia Rocsta is a four-wheel drive off-road vehicle built by Asia Motors Corporation in South Korea.
The Rocsta is derived from the Korean army's 4WD vehicle, also developed by Asia Motors. Because this model was cheaper than competing 4WD vehicles, it contributed to the increase in popularity of offroad racing in Korea.
Asia Motors launched the Rocsta in 1990, and retired it in 1997. From 1998, the Rocsta's replacement, the Asia Retona, was sold under the Kia badge.

UK sales of the Rocsta ran from 1994–1997, which included both 1.8 litre petrol and 2.2 litre diesel models. Both could be purchased with either a hard or soft-top. Both models were distributed by Kia Motors and used Kia copies of standard Mazda engines, with five-speed manual transmission.

[Otto Puzzell]

3728: MODEL SIX C-60 SEDAN 1922
5714: ROCSTA 4WD 1994
8387: COBRA 427 1985

8387: ERA Replica Automobiles manufactures the 427 Cobra replica in New Britain, Connecticut. "E.R.A. began in 1968, doing restorations of Porsches, BMW's and several British cars. In the first year, we fixed a totalled 289 Cobra (bought for only $1500 at the time by our current general manager, Pete Portante.  The car was sold about 8 years later - before the prices went crazy, of course.) and a Fiberfab kit car, among other projects.  In 1981, we started on our 427 replica. By 1985, all our restoration work ceased - we were just too busy doing our 427.  So far, we've delivered over 800 kits to 30+ states and a half-dozen countries."

[Paul Jaray]

..and only for you 6 players a special extension of the game:
Post 3 numbers each, between 100 and 103200 and let's see what happens!

I'm curious!
5219, 80405, 100197

I'm curious too !
1048, 10048, 100048

1048: Six 1927
10048: ARNAGE GREEN LABEL 2000
100048: 2HP MOTOR ROAD WAGON 1895

[Paul Jaray]

Ok, Let's try:
6017 - 10017 - 15017.

6017: VIRAGE 1988
10017: S3 SALOON 1962
15017: MODEL 61 TOURING SEDAN 1939

[Paul Jaray]

5219:     10hp 1924
80405:   Mark1 hatchback 1988
100197: Model 18 7-passenger Touring 50hp 1918

100197 hopefully is the 1918 Westcott Model 18.

For the other 2 numbers I need the first hint.

Very good!
+50
5219: 1st useless clue: just a production car, not a coachbuilt one, a racer, a replica etc.
80405: 1st useless clue: it's British

You can ask another number in order to have always 3 active numbers, if you like to.

[D-type]

My trio (still looking for volume manufacturers)

3179
3289
5713