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Try another key if you have a spare as sometimes the chip on the key itself will fail and the ignition system won't work because the theft deterrent thinks someone is trying to steal it and if that doesn't work you will need to go to Cadillac parts dept and have another made
You probably have a blown head gasket, check the oil to see if there is a tan to brown milky substance on it and if it does the head gasket will need to be replaced. you can get an estimate here www.repairpal.com/estimator and find a shop here www.repairpal.com/directory
Sometimes even though the fuse looks good it can be blown, so I would change that fuse first and if that doesn't work then test the plug at the wiper motor to see if its getting 12 volts and once that is checked, then the wiper motor must have failed
The window regulators have failed and you can get a estimate here www.repairpal.com/estimator choose window regulator
Ignition coil then distributor cap and rotor
You can find a free repair manual here: http://bit.ly/autozone_repair_info sign up its free and put in your vehicles info and choose Repair guides, The plugs are located under the ignition coils.
When it becomes noisy or it affecting performance due to chain stretching and throws the engine timing off, But they usually last the life of the engine if the oil is changed regularly
Make sure your cables and terminal ends are clean and tight first and was it doing the exact same thing before you changed the starter?
It might be a vent line is this a manual trans?
10W-40 is for -5 to 68 degrees F and 20W-50 is for 14 to 122 degrees F