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Funny you should mention this, as my VR-4 made a somewhat knocking noise this morning as I was warming it up. Right as I was about to get pissed and start figuring how much it was going to cost me I popped the hood. The "knocking" was louder (of course). I reached back and blipped the throttle and the "knocking" went away. I don't know what it was, but this was the first time I have cranked it up in the seriously cold weather. I had no smoke form the tail pipes at all, so that made me a little happier. I'm hoping it was just an isolated event , and I won't hear it again, but I'll definately be keeping an ear out for it.hrusky17 said:when i first start my car there are no noises but when the engine is still warming up and i rev the engine to a little over 2000 rpms there is a slight knocking sound. could this be anything serious considering that it goes away within 5 to 8 minutes? also some more ticking sounds have developed under my hood, the only change i made when i bought the car was from conventional to synthetic oil. i'm thinking of not putting mobil 1 in my car again, but i have heard that it is bad to go from a synthetic oil back to regular oil. the synthetic oil has only been in the car for about 1500 miles. please give me your thoughts and suggestions thanks.