Hi
For all those who are complaining about engine knocking in Wagon R here is the solution
(My car ODO is 62628km I haven't changed plugs, break discs and leathers in simple its totally stock)
Empty tour car tank and fill it with hi octane full tank.
Consume half tank then fill again with hi octane repeat this 2 more time and then back to super petrol and knocking gone.
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