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When a man fucks a woman/man's mouth while simultaneously shitting on the chest of the fellatio performing participant.
Jimmy's girlfriend was giving him head while Jimmy had a serious case of the runs (too much cheap beer). At one point Jim could not hold it in and in the middle of the mouth-fucking, let his bowels loose all down his girlfriend's chest; giving his partner her first ever Las Vegas Oil Change.
Changing the oil of your car in the parking lot of a auto store so you can buy and dump the oil off without having to drive to and from the store.
Me and my friend are going to do a red neck oil change, want to come?
Putting a funnel into someone's butthole and then diarrhea into the funnel, filling their ass with your diarrhea.
The Japanese are into some really weird stuff, ever seen a Japanese oil change?
The sexual act of placing a finger in your female sexual partners anal canal and vaginal canal simultaneosly to check her viscosity of either entrance. Then as the mechanic on duty you determine if she is a quart low and you give it her anally or vaginally after you attain the proper lubrication on your dipstick.
Lastnight as a part of foreplay I gave Jane a "two finger mexican oil change prior to having sex"
A rather working-class term for jacking off.
My boss asked me why I was fifteen minutes late for work; and I told him I was helping a friend get an oil change. Thankfully, he believed me.
When you stick two fingers up another persons anus, but you do it every couple of minuets. Since a regular mexican-oil change keeps adding oil, you keep adding your finger.
She was getting clogged up back there, so I gave her the 2 fingered mexican oil change, and now she "runs" clean.
A man sticks two fingers in a womans butthole and puts it in his butthole then sticks his fingers in her vagina by finishing with both fingers then in his mouth
Can I give you a Mexican 2 finger oil change. Or would you like me to change your oil