I don't care about engine seals, I will replace them, pretty cheap to replace them.
Just let me know if the oil is bad for engine running etc. When I bought the car it was being run on 20W-50, I switch to 10W-40 and now want to go fully synthetic. Engine doesn't have any oil burning issues etc Alhamdullilah
I just want to know if 5W-30 is bad in any way for my engine health in Karachi where ambient temperature is mostly 30-35
Reason to go fully synthetic is because it is stable, has more cleaning agents and I want to aim an OCI of 10,000KM (I put good quality oil filter and keep my PCV and air filter clean.