How much oil does 2003 cts hold - 2003 Cadillac CTS

You need to find the source of the oil leak and repair it.

during colder weather, the oil will be somewhat sluggish until it warms up, you may want to change to a thinner viscosity oil during the colder months of the year.

The warning unit may not be working, therefore it won't errase the light. You may be able to reset it by taking the hot side post off for a minute or two.

most likely the mechanic spilled oil when filling, check to make sure the oil filler cap is still on. if it is just spilled oil it should burn off and be ok.

Check front crankshaft seal from under car, see if you see oil coming out of back of pulley.

it will byitself just drive it a bit. the valve cover seals or plug tubes need replacing

Regular 5W30 oil will work just fine in the '03 CTS. Your owners manual will tell you to stay away from any other viscosity (5W20, 10W30, etc) because they will be either too thick or too thin. It does not require synthetic as it is equipped with a 3.2 liter engine that was more or less derived from the Catera, but just didn't break as much. They only ran that engine for a year and started using the 3.6 liter VVT (variable valve timing) which does require synthetic oil (5W30 Mobil 1).

after draining oil from engine,,,,,get under car ..locate oil filter and turn counter clockwise....get new filter rub a lil oil on the gasket of new filter and screw on....you can buy oil filter wrench at wal mart

Engine and transmission are completely sealed off from one another. No way changing the engine oil will affect the transmission unless a brain sturgeon put engine oil into the transmission by mistake. If you did the service, you know that didn't happen.

I had the same problem with my 2003 CTS. It seems it is a factory fault. The two struts that hold the lid up had no gas inside. You will need to have them replaced. About $80.