Ticking noise in engine bay
I have a ticking noise coming from the engine bay - the noise is only present when the vehicle is in D or R when stationary or moving slowly, therefore under slight load, and when the engine is warm. As I accelerate the ticking speeds up and then goes quite. The noise developed after an oil change - I have been using Caltex 15w40 multigrade and changed to Shell 15w40 multigrade. I am wondering if this is the cause? I will be doing another change to Castrol 20w50 this evening.
Any comments will be most appreciated!