hi,new to the site! I'm posting because i have this issue with my 05 Tahoe, i get the warning saying to check oil level every time i start it or open the key. The thing is that the oil is fine because i checked it and wanted to know if anybody else has come across this issue. I also wanted to know what type of tune up or service does it need for 100k miles cause I'm just over that and thinking of taking it in or doing it myself. Thanks for anybody who has any input.