although it does not save much to do your own oil change,you don't have to wait for some one else to do it. and you control the quality of your parts and labor
wal mart gave you the price for bulk dino oil. mobil 1 is about 5 dollars a quart,even for them. dino oil is about 75cents a quart for them.
if you are just starting to work on your own car,before you drain your oil, takes your keys from the ignition and put them on the passenger side on the floor.don't pick up the keys till you are 110 percent sure the car is full of oil and your oil filter is on.
when you start the car get out of the car quickly and check that the oil filter is not leaking.
if your filter seal blows,you will lose most all your oil before you can get back in the car. it happens very fast.even if you use dealer parts, check for leaks asap. wal mart has insurance for this, you don't.
did not mean scare you, doing your own work is really worth it.
have fun
good luck
rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car