stefank Posted August 20, 2006 Report Share Posted August 20, 2006 Hello all, I have been on vacation recently and had the car parked in our garage for three weeks using the storage mode. Started first try. I used to have a lifter clatter on startup after the car was parked for more than two days. I changed to synthetic 5W30 (this oil weight is recommended by my german owner's manual) doing the last oil change and put on 6,000 kms since. After these three weeks being parked I experienced a perfectly quiet start. At least in my case the synthetic seems to help here. Also no oil leeks after the change, engine bone dry. Oil consumption about 1 qt for these 6,000 kms (4,000 mls), no need to fill up yet. I used non-synthetic 5W30 before. Stefan Link to comment Share on other sites More sharing options...
Hud Posted August 20, 2006 Report Share Posted August 20, 2006 Had the same/similar problem on my 02 DTS. It would make what I called lifter clatter when I first started the car in the morning and would continue for about one or two miles of driving. Dealer could not find anything wrong. I decided to put Mobil 1 in the motor and the problem went away. It has been 8K miles now. I have now changed all of my vehicles to Mobile 1. Should have done it a long time ago. Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 20, 2006 Report Share Posted August 20, 2006 Here is a thread on a 98 STS... I thought it was interesting. It is possible that the synthetic oil that is so good at cleaning, cleaned out the direct acting lifters for you... Good The guru said this: QUOTE=bbobynski,Sep 29 2004, 03:47 PM] The engine does have lifters/tappets.....32 of them in fact. There is a direct acting hydraulic tappet on each cam lobe. It is very unusual to have a noise problem with the hydraulic tappets unless something else is wrong. http://caddyinfo.ipbhost.com/index.php?sho...l=direct+acting Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
chazglenn3 Posted August 20, 2006 Report Share Posted August 20, 2006 Mike; The link doesn't work....could you repost it? Charles Charles Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 20, 2006 Report Share Posted August 20, 2006 Mike; The link doesn't work....could you repost it? Charles Charles, try it again, it worked for me, I will find it and post another link, Mike Try this link http://caddyinfo.ipbhost.com/index.php?sho...0knock&st=0 Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
chazglenn3 Posted August 20, 2006 Report Share Posted August 20, 2006 That's weird...still not working for me. Maybe it has something to do with the firewall here at work. Charles Charles Link to comment Share on other sites More sharing options...
JimD Posted August 20, 2006 Report Share Posted August 20, 2006 This picture of the 2000+ valve train was originally attached to post #14 of the linked thread. http://i70.photobucket.com/albums/i101/Jim.../DSC00563-1.jpg Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
chazglenn3 Posted August 20, 2006 Report Share Posted August 20, 2006 Oh....that picture. I have seen it before, thanks, Jim. I thought that it was something related to the '98 STS. I have what I assume is a bad lifter in my car, but it is the old style. Charles Charles Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 20, 2006 Report Share Posted August 20, 2006 Oh....that picture. I have seen it before, thanks, Jim. I thought that it was something related to the '98 STS. I have what I assume is a bad lifter in my car, but it is the old style. Charles Charles, do a search under Bad Valve Knock and you will find that thread, Mike Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
JimD Posted August 20, 2006 Report Share Posted August 20, 2006 Oh....that picture. I have seen it before, thanks, Jim. I thought that it was something related to the '98 STS. I have what I assume is a bad lifter in my car, but it is the old style. Charles I included that picture because your engine is similar. The cam follower on your engine uses a rubbing or wiping action is the major difference whereas the roller cam follower in the picture produces much less friction and oil shear. A rocker arm and hydraulic lash adjuster arrangement is used in your engine. One day the term "lifter" (left over from pre-OHC days) will surely fall out of favor when talking about OHC engine noises. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
chazglenn3 Posted August 20, 2006 Report Share Posted August 20, 2006 Thanks, Jim. I use the term "lifter" because they are still calling them that in the factory servcie manual. I understand what you are saying, however. Charles Charles Link to comment Share on other sites More sharing options...
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