My 4 cyl 1997 smokes sometimes after siting for 12 hours.Smokes only at startup.It has 65000 miles with Toyota Extra Care, 100k warrenty. I have all my receipts for oil change. I usually bought my own, Castrol, because I wasn't sure what the bulk oil was. I have used Toyota oil filters ever time except once when I used a Champ at a chain. The Champ filter was installed at 60,000 miles. At 60,000 miles the trans was flushed. Now the car smokes at 65000 sometimes. Was the constant idleing of the engine to have the trans flushed the cause of the smoking. Was the Champ filter the cause of the smoking ? Is Castrol an acceptable oil 10w30. The dealer tells me its probably valve seals. The dealer tells me that it is covered in extended warrenty. From reading these posts I am now concerened with sludge and improper maintenance. The dealer is nice enough but I don't trust them and I can't afford to have my car stuck there with a 3000 dollar bill. Can this wait for a month ? Is Champ agood filter ? Is Castrol good oil ? Thanks for any opinions .