Quote:
Originally Posted by rohe
a) Which parts do I need to have checked?
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Address your manual, perhaps. Just for example, see page 252 ("Maintenance")
here.
Quote:
Originally Posted by rohe
b) I have no problem with the gearbox, but is it still necessary to change the oil?
c) There is no sound in the chain, is there a need for a change?
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If your gearbox is manual, you don't need to bother, probably. If automatic, it looks advised you should change the fluid regularly and if you haven't yet, changing may cause issues already (at 120k).
So for both gearbox oil and engine chain, if you feel overcautious and don't find it expensive, changing should cause no harm (unless it's a "delayed" AT).
Quote:
Originally Posted by rohe
d) I changed the spark plugs to NGK LASER IRIDIUM 20 thousand km ago. How many miles will it go?
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"You tell me."
OEM spark plugs would serve at least(!) another 20 thousand km, depending on your fuel quality.
Quote:
Originally Posted by rohe
My to-do list;
3- replacement of all antifreeze liquid (castrol nf blue - pure water)
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I would replace this point
with brake fluid replacement (unless you did it recently: it needs replacement once in two years, AFAIK).