Endurance Series

In the Endurance Series races it's not so much about finding the right car as it is to make them go as fast as possible. With that in mind, I will recommend the fastest possible car at any given level. That means the Formula Gran Turismo until you get the Red Bull X2010. You can get the X2010 by getting at least bronze in the Red Bull Challenge Special Event (unlocked at LV 30) or when you reach B-Spec LV 35.
I will also list the time I got in those races along with XP/Min. In B-Spec races, I use the time it takes when not giving any orders.
In timed endurance races, I will list the amount of laps the AI finishing in 2nd place under dry conditions. While these numbers should be very accurate, I take no responsibility if they drive longer in your race. The idea is that you use the fastest car available and when you have driven more laps then you know the AI will do, you can stop the car right before the finish line, then come back and cross it right after the race have reached 4, 9 or 24 hours depending on the race time. This way you don't have to drive for the entire race and can save up to 8 hours on Le Mans 24 Hour for example. I do recommend checking back the last hour to make sure you're safely in the lead.
Grand Valley 300km LV 25
A-Spec: 
Cr. 150,000 - Exp: 250,083 (1.06)
B-Spec: 
Cr. 49,000 - Exp: 99,900 (1.06)
Entry Requirements: No Limitations
Hardest Opponent: 341 BHP - 1730kg - Toyota SOARER 430SCV '01
Tyres: No Limit -
Sports: Soft
Used Car Dealership:
Formula Gran Turismo - Cr. 5,000,000 at 0km mileage.
A-Spec:
B-Spec: Hard Sports Tyres. 1:41:54.106 - 979 XP/Min
Roadster 4-Hour Endurance LV 26
A-Spec: 
Cr. 177,000 - Exp: 332,637 (1.06)
B-Spec: 
Cr. 57,900 Exp: 117,259 (1.06)
Entry Requirements: Specified car list - see entry requirements in the game
Hardest Opponent: 165 BHP - 1100kg - Mazda Roadster RS (NC) '07
Tyres: No Limit -
Sports: Soft
AI Laps: 200 Laps (Mazda MX-5 1800 RS (NB,J) '00)
Dealership:
Mazda Roadster RS (NC) '07 - 25,000
A-Spec: 4 hours - 1,385 XP/Min
B-Spec: Soft Sports Tyres. Consider to max tune it for safety. 4 hours - 489 XP/Min
Laguna Seca 200 Miles LV 27
A-Spec: 
209,000 - Exp: 411,003 (1.06)
B-Spec: 
Cr. 68,500 Exp: 165,220 (1.06)
Entry Requirements: No Limitations
Hardest Opponent: 449 BHP - 1569kg - Dodge Viper GTS '02
Tyres: No Limit -
Sports: Soft
Used Car Dealership:
Formula Gran Turismo - Cr. 5,000,000 at 0km mileage.
A-Spec:
B-Spec: Soft Sports Tyres. 1:55:25.770 - 1,437 XP/Min
Indy 500 LV 28
A-Spec: 
Cr. 247,000 Exp: 750,893 (1.06)
B-Spec: 
Cr. 80,900 Exp: 271,155 (1.06)
Entry Requirements: No Limitations
Hardest Opponent: 905 BHP - 900kg - Pescarolo C60 Hybride - Judd Race Car '05
Tyres: No Limit -
Racing: Soft
Used Car Dealership:
Formula Gran Turismo - Cr. 5,000,000 at 0km mileage.
Buy Soft Racing Tyres.
A-Spec: 2:19:50.518 - 5,363 XP/Min
B-Spec: 2:37:33.063 - 1,721 XP/Min
Tuning Set Up (inside the spoiler):
Spoiler! (click here to reveal)
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Downforce:
Front 40 Rear 55
Transmission:
Top Speed: 410KM/H - About 255 Miles pr hour (pick closest setting)
LSD:
15/45/55
Suspension
Height: 5/5 10/10 for Bumpy
Spring Rate 17.4/17.5
Dampers E 8/8
Dampers C 6/6
Roll Bars 7/7
Camber Angle F 2.0 R 1.0
Toe Angle F 0.00 R -0.20
Brakes:
Brake balance 4/1
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Suzuka 1000km LV 30
A-Spec: 
Cr. 345,000 Exp: 1,236,370 (1.06)
B-Spec: 
Cr. 112,900 Exp: 400,656 (1.06)
Entry Requirements: No Limitations
Hardest Opponent: 509 BHP - 1100kg - Nissan XANAVI NISMO Z (SUPER GT) '06
Tyres: No Limit -
Racing: Soft
Used Car Dealership:
Formula Gran Turismo - Cr. 5,000,000 at 0km mileage.
A-Spec:
B-Spec: Hard Racing Tyres. 5:07:56.024 - 1301 XP/Min*
*Can take more than an hour longer if it rains.
Nürburgring 4-Hour Endurance LV 32
A-Spec: 
Cr. 481,000 Exp: 2,063,947 (1.06)
B-Spec: 
Cr. 157,500 Exp: 682,105 (1.06)
Entry Requirements: Racing Tires Only
Hardest Opponent: 616 BHP - 1120kg - Amuse S2000 GT1 Turbo
Tyres: No Limit -
Racing: Soft
AI Laps: 28 Laps
Used Car Dealership:
Formula Gran Turismo - Cr. 5,000,000 at 0km mileage.
A-Spec: Hard Racing Tyres. 4 Hours - 8,599 XP/Min
B-Spec: Hard Racing Tyres. 4 Hours - 2,842 XP/Min
Tsukuba 9-Hour Endurance LV 33
A-Spec: 
Cr. 569,000 Exp: 3,472,212 (1.06)
B-Spec: 
Cr. 186,000 Exp: 966,747 (1.06)
Entry Requirements: Racing Tires Only
Hardest opponent: 616 BHP - 1120kg - Amuse S2000 GT1 Turbo
Tyres: No Limit -
Racing: Soft
AI Laps: 550 Laps
A-Spec: 9 Hours - 6,430 XP/Min
B-Spec: 9 Hours - 1,790 XP/Min
24 Hours of Le Mans LV 35
A-Spec: 
Cr. 794,000 Exp: 6,890,550 (1.06)
B-Spec: 
Cr. 260,000

Exp: 2,869,710 (1.06)
Entry Requirements: No Limitations
Hardest opponent: Pescarolo C60 Hybride - Judd Race car '05
Tyres: No Limit -
Racing: Soft
AI Laps: 387
A-Spec: 24 Hours - 4,785 XP/Min
B-Spec: 24 Hours - 1,993 XP/Min
24 Hours of Nürburgring LV 40
A-Spec: 
Cr. 1,830,000 Exp: 9,800,456 (1.06)
B-Spec: 
Cr. 599,000

Exp: 4,166,092 (1.06)
Entry Requirements: No Limitations
Hardest opponent: 794 BHP - 900kg - Pescarolo Courage - Judd GV5 Race Car '04
Tyres: No Limit -
Racing: Soft
AI Laps: 172 (perfect conditions)