In this guide, you will replace the engine oil, oil filter, and air filter of a Keeway RKV 125 from 2011 to 2014. Obtain one litre of Repsol SAE 10W40 oil, oil filter HIFLO HF131, air filter, and WD-40. Position the bike upright on the centre stand. Place a container under the engine to collect the used oil. Using a 21mm spanner, unscrew the oil drain plug located under the engine casing. While the oil drains, replace the oil filter. The oil filter is located on the right side of the engine. First, place a cloth or paper on the exhaust manifold to prevent oil from spilling on it. To access the filter, remove the cover with the manufacturer's logo, secured by three 10mm bolts. Once removed, extract the oil filter housed inside the casing. After replacing it, spray WD-40 on the green sealing gasket. Reassemble the cover. Now replace the air filter located under the left side fairing of the bike. The fairing with the Keeway logo is clipped in and held by a fixed screw at the bottom. Once removed, you will see the air filter head. To extract it, unscrew the three star screws on the wide collar. When reassembling the fairing, spray WD-40 on the three plastic fixing pins. Now tighten the oil drain plug until fully tightened. Open the oil filler cap located on the casing to the left of the oil filter and add SAE 10W40 oil, referring to the inspection hole located at the bottom of the casing. Start the engine for one minute, turn off the bike, wait five minutes, then recheck the oil level.