If they are usable pa, we give them away to people with same model or similar cars. If not, tapon na like brake pads, clutch disks, oil and air filters.
kasi karaniwan, pagmagpapa-ayos magdadala ng 2 sasakyan, yung ipapagawa at yung pangbili (pag malayo yung auto supply), so in this case e.g. palitan ang filter pag magpapachange oil, tatangalin muna yung filter at saka palang bibili as to where kapag may nakatabi ka na sample bago ka magpachange oil bukas makakabili ka na ngayon ng filter at mga langis na kailangan mo at pagdating sa pagawaan isang trabaho na agad at di na maaantala, saves you time kumbaga..
depends... like when I replace radiator hoses (preventive, di pa sira) I keep a set when I was still driving a 20year old car... Same goes with fan belts, radiator cap etc... luma na kasi sobra kotse eh.
if the car is relatively new naman i just leave it sa store in case magamit nila sa ibang emergency cases.
Depends on what type of parts, pag sa mga suspension or engine parts inipon ko then pag dami na benta ko sa junkshop por kilo, yung used motor oil naman bigay ko sa friend ko who is in the construction industry (maganda daw ipahid sa kahoy used oil para anti-anay), tires naman dinadala ko sa office pag di na pwede magamit (ginagawa daw bagsakan ng drum when unloading drums from trucks), battery naman trade in ko para discount.
When I sold my old car, all the old parts from previous visits to the casa were in the trunk. So yeah, I tend to hold on to replaced parts unless they're beyond repair.
I changed steering wheels last year and my stock unit is still in my closet.
The exception is brake pads, which I replaced recently. They're still relatively healthy, with a good layer of brake lining left above the service limit. However, I've read that brake dust is pretty bad for your lungs, so I got rid of mine ASAP.