Every year, as scheduled.
Bought my car in 2016, 1 year later I got the first service after 4200 km, and in three months it's time for the second service, this time with 9000 km.
I swear to fucking god the man who'll buy my car used, since I change it every 3 years, is a lucky motherfucker.
I just top it off as it burn away.
oil every 5k filter every 10k, so like every 3-4 months/change, 2001 civic ex
for some reason I want to say the service manual had 10k listed for normal use and 5k for the "harsh conditions" estimate but I don't feel like going to the garage to look it up rn
whenever it looks black or every 3k miles
Every 15k miles, full synthetic. I also change the filter at the same time.
every 10k km or 12 months, whichever occurs first...
Every 3k. Ferd f onefiddy
I only put on a few or maybe several thousand miles a year so I just change it every spring and call that close enough to the recommended service interval.
Mobil 1 5W-20, I use the 'extended mileage 15,000' stuff but change it every 7,500 miles.
My bike's manufacturer recommends every 20k km or every 10k km if it's raced or ridden hard offroad / in competition. I just do it every 10k km for peace of mind, it's my commuter to uni