when to replace shock absorbers

[dr. d]

Nasa magkano ang shocks ng sasakyan?subcompact sedan for example. Matagtag na din yung takbo ng akin pag lubak, nagpachange oil ako neto and napansin ko kinakalawang na na yung shock sa likod yung isa is nagpapawis(sinabi sa kin nung mechanic na leak nga yun pero hindi gaano), i dunno if effect din ng paliting shocks na yung pag lubak and medyo matulin, sobra kalabugan ng gulong?

wet shocks are a sign of impending shock death.
rusting shocks, can be something, or can be nothing to worry about. as long as they work, that's fine with me.
rear shocks are usually cheaper, as their design is generic (one design fits many). less than 1K, last time i bought, a few years ago. much easier to install than fronts.
front shocks are specialized for the car model, are more complicated a design, and therefore cost much more than rear shocks. 2-3K thereabouts ang natatandaan ko. they're also a pain to install. i never tried to DIY it, as i have no specialized tools.

the most common manifestation of perished shocks, is the car bobbing up and down several times, when it rolls over a hump.
another common sign, is extremely hard shocks, as in, frozen.