20w50 is a bit heavy oil for your car. But our mechanics love to use this grade oil in all the car's according to them
"haiilll jitna mota ho utna acha ha"
they are totally wrong. If the engine is in good condition and not reducing oil then nothing is wrong with 10w40 oil they will perform good than 20w50 in your econobox...
As for cultus API SG is recommended with viscosity 10w40. If you want to try something other than 10w40 then you can use 15w40 API SJ by zic.
About caltex havoline 10w40 API SJ would also b good if you find the orignal product.
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