I thought Volvos had an 18k mile or 12 months (whichever is first) manufacturer specified interval anyway, so all you've done is drop back to a 'normal' regime, which is the best the vast majority of cars will get anyway.
It would make far more sense if cars had service intervals based on engine hours instead of miles, like tractors do. My wife's car gets almost exclusively used for 50 mile motorway commutes and has a long term average speed of 55mph on the trip computer. That equates to 181 engine hours to complete 10000 miles (in about 6 months). The oil still looks pretty much new on the dipstick when the car goes in for its 10k oil change!
A car that gets used mostly around town would average speeds of less than 20mph, so would have had the engine running for nearly three times that amount of time to clock up the same mileage.
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