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Who told you it needed replacing at 25,000 miles as that is simply not true? The truth is that it must be replaced every 60,000 miles. Warning: This is an interference engine. If the belt breaks you will have internal engine damage.
They vary. Not counting the Sun itself, the 10 closest (known) stars are spectral classes M5, G2/K1, M4, M6, M2, A1/DA2, M5 and M6 (the slashes represent close binaries where there are two stars at effectively the same distance). The Ms have surface temperatures of less than about 4000K. The K has a surface temperature of about 5200K, the G is around 5800K, the A is around 10000K, and the DA is roughly 25000K.