Fellow forumers, I would like to ask some help.

I have a 96 bilog lancer that was just changed oil last month. I noticed that upon startup morning may hissing squeeking sound that may come from the engine (guess only). After revving up the motor for 2 to 3 minutes ok na po and walang nang abnormal sound noise. During driving eh ok din naman.

Problem:
Abnormal squeeking hissing sound start up


I'm pretty sure hindi po sa brakes kasi di pa umi ikot ang gulong.




Thanks in advance!