i bought 2000 model opel corsa 2 yrs back it was running
i bought 2000 model opel corsa, 2 yrs back. it was running smoothly. but lately, when we sit inside or get down, we can hear a creaking sound. what may be the cause ? also what can i do to improve its mileage ? it is presently giving me 10 km per ltr. can i fit lpg kit to it ? how risky is it ? pls reply