7500km total driven
3200km since last oil change
last oil change 10w40 SM from suzuki workshop with free tuning at 4300~km total driven
owner manul says to change every 5K but more than 1/4th of engine oil is gone (plus it was a not a great oil to begin with)
time since last oil change 7 months (i don't drive much).
my local mechanic is saying to get 5w30 kixx but i am more inclined towards 10w40 semi synthetic.
Plz advice. Thanks.