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[Bumbazor]

I did an oil change last night and got myself ready for starting this morning.
Luckily it was cold so it was more likely I would hear the tapping due to the temperature (more obvious in cold thatn warm weather).

I started it and heard absolutely no tapping at all!

I'm surprised that just one oil change could have such an effect, but the old oil was probably too old (it was black).

Anyway, it purrs rather nicely now, and is even more of a pleasure to drive.

Only problem is I knackered the torx head on the sump plug getting it out; anyone got a good condition torx sump plug?

[feeutfo]

99% it'll be a hydraulic lifter, a couple of short oil and filter changes will reduce it right down.

Had it on mine - a couple of oil/filter changes cured completely.  Use Vx semi-synth 10W/40 oil.

Yep,lazy lifter, defo sign the oil needs changing, maybe twice in quick succession. Vx oil is best for migs and cheapest for once. Think they are still doing the 20(?)litres for £30 deal.

However a leaking or cracked manifold/gaskit can make a similar noise, and it can slowly disappear as it warns up as heat expansion closes the gap. Sounds like a fut fut fut exhaust blow noise
Lifter is a  tok  tok  tok and is more pronounced from inside the car.
Hth.

[Bumbazor]

This was definiately tok tok tok and not fut fut fut, so looking like the lifters were the issue.

[feeutfo]

This was definiately tok tok tok and not fut fut fut, so looking like the lifters were the issue.

You know what to do....Should also add the above mentioned oil deal is a trade club offer. But its still cheapest without a trade club card from here...
http://www.autobahnstormers.org/

[Bumbazor]

You know what to do

I've already done the change though... it cured the problem.

[NaughtyNigel]

....... or the start of a bit of piston slap?

Our Astra Arctic (1.6 16V) has suffered quite badly from this when cold even ever since new, but it is fine once the engine has warmed up.

Our Omega (2.5 V6) makes a noise exactly as described, but I don't think it is anything to worry about. As with any engine, just make sure you let it warm up beofre giving it any stick.