guys, kakachange-oil lang po nung 99lxi a/t
from fully synth Red Line to fully synth Royal purple.

now my prob is may naririnig akong weird sound coming from the engine when im inside the cabin (driving). the closest sound which i could describe you is parang bubbling/boiling, im not really sure. could this be the "knocking sound"?

i need some piece of advice.
thank you.