About $40 for the gasket... And about book value of your car to replace them.
The 2005 Cadillac CTS's engine produces 194 ft-lbs. @ 3300 rpm.
The 2005 Cadillac Escalade's engine produces 380 ft-lbs. @ 4000 rpm.
The 2005 Cadillac SRX's engine produces 252 ft-lbs. @ 2800 rpm.
The 2005 Cadillac Escalade-EXT's engine produces 380 ft-lbs. @ 4000 rpm.
The 2005 Cadillac Escalade-ESV's engine produces 380 ft-lbs. @ 4000 rpm.
The 2005 Cadillac CTS-V's engine produces 395 ft-lbs. @ 4800 rpm.
According to Kelly Blue book the value for a used 2005 GMC suburban in Good condition is $17475.00. If the vehicle is in fair condition the value decreses to $15975.00
6 quarts of mobile 1 5w30 fully synthetic for the 3.6
The MSRP of a Cadillac SRX will vary depending on the options the car has. The car will typically have an MSRP of about $33,500. You may be able to get a much better price.
The cost for postage in 2005 was 37 cents.
For fair market value, check Blue Book and enter the specifics about the car's mileage and condition. You may also check your local classified ads to see what people are asking for in your area.