Lusso Posted March 18, 2007 Report Share Posted March 18, 2007 This problem has been getting gradually worse over about 6 months. When starting from cold and the car has been left standing overnight, i get a knocking just for a couple of seconds when starting. Is there a seperate filter and gallery which is meant to prevent this happening as it sound as though the oil is not picking up quick enough. Its going in this Wednesday to an independant but just wondered if any one had experianced the same problem? Link to comment Share on other sites More sharing options...
Ska Posted March 18, 2007 Report Share Posted March 18, 2007 How long ago was the oil changed? Have you tried using Magnatec? Link to comment Share on other sites More sharing options...
Lusso Posted March 18, 2007 Author Report Share Posted March 18, 2007 I will change the oil when it goes in this week but i have to say it was only changed 4000 miles ago but i decided to use a Miller 0-30 oil which might not be compatable? Are you suggesting the Magnatec edge 5-30 ? Link to comment Share on other sites More sharing options...
cruiser647 Posted March 18, 2007 Report Share Posted March 18, 2007 0-30 oil is probably a bit too watery to be of use. No oil is left in the head/tappets and they need to be re-filled on each start up. Link to comment Share on other sites More sharing options...
Botang Posted March 18, 2007 Report Share Posted March 18, 2007 I guess it depends whether the ends or the tappetts are knocking. Not being rude but when you say ends are you just guessing or are you speaking from experience? Tappetts sounds more likely. Link to comment Share on other sites More sharing options...
S4_Dan Posted March 18, 2007 Report Share Posted March 18, 2007 My A8 has started to do this, tappets noisy and start up. Going to do an oil change but what is the best stuff for the old trusty V8? Dan Link to comment Share on other sites More sharing options...
Lusso Posted March 18, 2007 Author Report Share Posted March 18, 2007 Well i was working on where the noise is coming from top (hydraulic tappets) or bottom (big or little ends) of the engine and mine sound likew the bottom. Im just hoping that an oil change will do the trick Link to comment Share on other sites More sharing options...
mkoneman Posted March 18, 2007 Report Share Posted March 18, 2007 (edited) Well i was working on where the noise is coming from top (hydraulic tappets) or bottom (big or little ends) of the engine and mine sound likew the bottom. Im just hoping that an oil change will do the trick thicker oil will only help a slight top end rattle due to the tappets being oil filled, if you think its big end knock i doubt very much that it will help as a bit of oil isnt going to help wear in the bearings Edited December 25, 2009 by Figure11 Link to comment Share on other sites More sharing options...
Ska Posted March 18, 2007 Report Share Posted March 18, 2007 Sorry I was under the impression they were the tappets (hydraulic cam followers/lifters ) if its your big ends then might a thicker viscousity oil be better or proly make little difference since the bearings may have worn Having said that is it drinking oil? Link to comment Share on other sites More sharing options...
Botang Posted March 19, 2007 Report Share Posted March 19, 2007 Now for the good news, they dont sell bearings for our cars, they dont even list tightening torques. You can get bearings for an A6 4.2 though which should in theory be the same, they are not cheap though. Link to comment Share on other sites More sharing options...
Muppet_man Posted March 19, 2007 Report Share Posted March 19, 2007 The noise your hearing will be almost cerainly top end rattle. Bottom end noise will be a low deep noise which if you rev the car will growl or knock even louder even after the first few seconds. Once the engine then gets very hot it will also return again. Bearings are available for this engine, in standard and two oversizes, but quite honestly if they were worn, then many other things in the engine would be worn also. Small end noise will not go away within the first few seconds. The pistons need to warm up enough to take up the play in the gudgeon pin, this will take a minimum of a couple of minutes as a general rule. The V8 engine is pretty much bullet proof in the wear area, although like anything, one or two slip up just to prove the rule. Even so you would have to be very unlucky or have abused the car via its servicing and oil/filter type. On the next oil change, make sure you use the correct viscosity oil and an original make oil filter, as some cheap ones don't have the correct non-return valve fitted. Don't worry about super expensive long life oils, any machanic worth his sorts will tell you a cheaper grade but quality oil changed twice as often is much better. Also use a basic adative with a PTFE base. This will not stop the top end chatter on start up, but it will leave a coating over the components and therefore avoid future wear. Good luck. Link to comment Share on other sites More sharing options...
nikw Posted March 19, 2007 Report Share Posted March 19, 2007 According to my manual the correct oil viscosity for the ABZ engine (1995-99 4.2 V8) is 10w/40 or 15w/40 in warm weather. The consensus of opinion is that semi-synthetic works best - some have reported heavy oil consumption when using thinner fully synthetics. You may also want to check your oil level - Mrs NikW's A6 gets tappety if the oil level is very low. Link to comment Share on other sites More sharing options...
Lusso Posted March 19, 2007 Author Report Share Posted March 19, 2007 Many thanks for the information, lets hope an oil change will do the trick. Link to comment Share on other sites More sharing options...
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