Bad move. Dont spray oil or wd40 again.
It eats paint. It eats up body cavity wax. Its kerosine based so it dissolves the already present grease and your suspension is sealed so you cant do anything about it.
I have a brand new swift with 15k on the clock and its been like this since the day i bought it.
The reason im okay with it is that i checked my friend's automatic swift and it has the same squeaky noise on speed bumps.