Salam
I have an old cultus 2011 model and I need to change my oil the previous owner used 20 to 50 grade oil and after I purchased the car I changed the oil with the same grade 20 50.now after doing some research I found that 20 50 is used for old engines.my car has no blow or not any smoke but after consulting with the few mechanics. They all advised me to put 20 to 50 grade oil. They are saying in summer the car needs a heavier oil which I did not understand. Its my first car and I don't know about these things
Can any of you guide me what I should do if you need more info tell me
JazakAllah
