Salamf friends,
My car Toyota corolla xli 2012 model is driven 25000 KM and I have been using HAVOLINE ProDS FULLY SYNTHETIC 5W 40 oil. I don't drive the car very often. Is it possible for me to switch to HAVOLINE FORMULA SAE 10W 30 ? I hope it won't harm the car, the reason to consider this oil is cost but definitely not at the cost of compromising engine. Please advise.