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I was interested in a comment you made in one of your recent replies regarding modern engines and oil flow when an engine is cold.

My last vehicle a Mitsubishi Lancer and my present vehicle, a late model Toyota Corolla seem to emit a small amount of engine noise for the first few seconds after starting from cold, until the oil has fully circulated to the top of the engine. I've always used good quality oil, changed it every 5,000kms and used manufacturers branded filters.

I have been told by the dealers that some noise is normal on the modern multi-valve engines these days, and as long as it goes away quickly after starting, not to be concerned.

Is this true?

Glen

From the "Ask Jack" archives - 2 October 2009

I tend to agree with the dealer to a certain point however there are limits to how long such a noise should last. The noise may be audible because full oil pressure has not been reached on the initial engine crank and until it does (once the engine is running), the noise will remain.

Watch the oil warning light, it should go out almost immediately the engine has started. The noise you are hearing is probably oil trying to reach the components the greatest distance from the oil pump such as the camshaft which is situated at the top of the engine. A deep knock is more of a worry than a small rattle.

I must say I don't hear such noises on the car I drive on a daily basis (2007 multi-valve 2.0 litre travelled 30,000kms).

If you are concerned about the noise, ask the dealer to demonstrate another car (the same model).

If it makes the same noise for a similar time then you have to accept it as normal. If it doesn't ask the dealer for an explanation as to why.

You need to make some allowance for an engine which is mass produced and tolerances which can be at different ends of an acceptable limit.