With the return of the 1998 Mercedes-Benz CLK-LM, with a 2,000,000-Cr. increase, all cars have now been seen after the 1.38 update, and the OP is finalized. A few housekeeping items:
Between 1.31 and 1.38:
- 18 cars increased in price
- 9 cars decreased in price
- The 20,408,000-Cr. (6.36%) net increase is the highest, both in absolute Cr. and percentage, of the 5 price adjustments, topping the August 2022/1.20 16,878,000-Cr. (6.04%) increase
Going back to each car's introduction (pre-1.38 cars only):
- 42 cars increased in price between their introduction and 1.38 (some notes follow):
- The largest in Cr. is the 1967 Ferrari 330 P4, at 11,000,000 Cr. (122.22%)
- The largest in percentage terms is the 1997 Porsche 911 GT1 Strassenversion, at 233.33% (7,000,000 Cr.)
- The third car to more than double in price is the 1992 Ferrari F40, with a 144.44% (1,950,000 Cr.) increase
- The cars that increased the most number of times are the 1997 BMW McLaren F1 GTR Race Car and the 1995 McLaren McLaren F1 GTR - BMW (4 of 5 possible)
- 29 cars are the same price as their introductory price
- 8 cars decreased in price between their introduction and 1.38:
- 1964 Aston Martin DB5 - -41,000 Cr./-4.23%
- 1987 Audi Sport quattro S1 Pikes Peak - -100,000 Cr./-5.00%
- 1958 Chevrolet Corvette (C1) - -3,000 Cr./-2.38%
- 1970 Dodge Challenger R/T - -15,000 Cr./-5.93%
- 1954 Ferrari 500 Mondial Pinin Farina Coupe - -1,300,000 Cr./-32.50%
- 1963 Ford Ford Roadster - -50,000 Cr./-11.11%
- 1954 Maserati A6GCS/53 Spyder - -400,000 Cr./-13.79%
- 1955 Porsche Spyder Type 550/1500RS - -500,000 Cr./-10.00%
- 30 cars have had multiple increases in price
- 3 cars have had multiple decreases in price
- 11 cars have had both increases and decreases in price, including 2 that have had multiple increases and multiple decreases
- Other than the 1958 Chevrolet Corvette (C1), which decreased in price in its only price adjustment opportunity, no car has changed in price every time it could have