I've recently bought a Santro Club which is 70,000 driven. Engine is in perfect condition and running smooth. I need your expert opinion regarding the engine oil selection. Previous owner was using Caltex Havoline (don't know abt grade).
I want to replace this oil with Zic-A or Mobil1 (as i heard these are good), pls suggest the best oil and grade, keeping in view the mileage. Further, I'm driving it only on petrol.
Do I need to flush the engine before oil change?