i hv a mehran 2007, used for daily traveling with in city for routine house hold work.
i had used zic 10W 40 in engine from start. after 85k km it starts reducing oil. after some time consumption increases then on mechanics advise started shell red 20 W 50 .
after 135k km oil consumption was increased slightly more. i went for engine overhaul. After overhaul in summer this year, mechanic used to fill Caltex 20W 50.
Firstly, Can any one guide 20 W 50 is gud after overhauling as it is quite viscous one or should i move to less viscous oil?
Secondly, in recent cold season my car engine started vibration in cold start, and on idling. is that problem due to high visocos oil or any other issue of fuel adjustments? i used to get fuel adjustment from suzuki dealership but problem still therr.