sir @chocollato10 engine oil change is due every 5~7000 kms use engine oil 5W-30 of known brand.
23000 km is very low milage for plug change, not to worry. You may change air filter, ac filter and engine oil filter at next service. your local 3S shop can provide you all these parts oem new.
carefully select from following 2 workshops if you do not want to use services of Suzuki 3S shop.
Jehangir Motor Garage
Jaranwala Road,
Faisalabad.
Tel: (041) 710616, 541097
0321 9664142
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G.M. Autos
21/1 Jail Road,
Civil Lines, Faisalabad.
Tel: (041) 641925, 0300-6636733
workshop information above is from this forum about 20 years old, please cross check service charges and time frame | a feedback post will be appreciated