I have a 2006 Cadillac STS 3.6 V6. When I purchased it from the dealer on 8/8/11, there was virtually no oil in the engine. I put in 3 quarts of Mobile 1 synthetic and I only fill up with premium unleaded 100% gas. When I refuel (regardless of how much gas I have), the car will have trouble starting. It will crank, and sometimes won't turn over. The battery, alternator and starter are good. Now, it has stopped while I was driving and will not start. I was told it could be the injectors and to try using Seafoam, but I'm not sure what to do at this point.

Is this a V8 or V8 If it is a V6 it has one, if it is V8 it has 2, the other sensors are for the monitoring of the catalytic converter efficiency. If I had the code and exact engine I could be of more help.

1979 Cadillac Coupe 425 engine running; flywheel knocking

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1979 Cadillac Coupe 425 engine running; flywheel knocking ...Change Transmission Fluid pan removal Cadillac Seville part1 - Duration: .

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There are several things to look at and check for a no start situation. Did the dealer diagnose the wiring? to replace all of it? I would think that if all the wiring had to be replaced, it would have taken out some computers also. You have many on this car. If you don't have compression, it cold be timing. If the timing is good, then the rings are bad. This would cause major oil leaks. I would do my own compression test and check the timing belt/chain.

You should return the car to the dealer you bought it from
& let them solve the problems

Sounds as though it had issues & they just washed it & sold
it to you

You need to go through the entire car checking & working on
almost everything, when ever you buy a used car

At least diagnose what ever the current problems are
Can't use it like that

You can be told all kinds of things & waste your time adding
products that do nothing if you like

the northstar engines burn incredible amounts of oil....your owners manual will explain.....'oil consumption'....but the reality is keep checking it...the 'idiot light comes on...or info center...low oil when it is 2 quarts down....another of GM follies...i have a northstar Caddy too.....

LS1 4.8 5.3 6.0 takes around 6 liters with oil filter. put 5 liters then run for 60 secs let sit for 5 mins then top it up till it reads full on the dipstick .( DO NOT OVERFILL)

Cadillac 2003-06 CTS, 2004-06 SRX with base audio system, 2005-06 STS
Press the up and down arrow on INFO button on right side of driver information center display to access the DIC menu. Once 100% Engine Oil Life menu is highlighted, press and hold the CLR button. The percentage will return to 100 and oil life indicator will be reset. Repeat steps if not reset to 100.
Cadillac 2003-06 CTS, 2004-06 SRX with Navigation System
Turn the system on by pressing the PWR/VOL knob once located at lower left of DIC display. Pres INFO button located to the left display to access the vehicle information menu. Turn the TUNE/SEL knob located at the lower right of the display until engine oil life is highlighted. Press the knob once to select it. Once the 100% engine oil life is displayed, press the multi- function button next to the reset prompt in the upper right corner of the display, the percentage will return to 100 and the oil life indicator will be reset. Repeat steps if not reset to 100.

It is not visible from the top. It is on the back side of the engine. Visible from the bottom of the vehicle. Use a jack stand whenever going under your vehicle to be safe. Always engage the parking brake, and have an assistance watching you. Good luck.

Probably didn't hurt it, my 2002 was ran for 2000 miles 1 1/2 quarts low on oil due to dummies putting only 5 quarts of oil back in it after changing the oil. It takes 6 1/2 quarts. It didn't hurt it at all.

No, it's not unusual to have to put a quart in within those miles'