Hey guys,

So since my car burns a lot of oil (130k miles), I decided to take a mechanic's suggestion and added about 1/2 quart of Marvel Mystery Oil to my car. I did not overfill it or anything. I did this about 3 days ago.

So when I was driving home tonight I revved the engine to like 5k while accelerating, and all of a sudden I heard a pretty loud noise, so I immediately let off the gas. Then when I slowed down I noticed the car sounds a little weird, and there was also a horrible smelling smoke coming out the engine bay.

After a while the smoke went away but now the car sounds really strange while driving, almost like an electric motor and there's also a slight metallic rattling noise. It also smells pretty bad. It seems just as powerful as before and doesn't shut off or anything.

Any ideas what happened and did I mess up my engine? Or is this normal for Mystery oil? Thanks.

CLIFFS: Added Mystery Oil, car sounds weird, and smells like crap now.

 

Moral of the story: Don't use snake oils.

And no, loud noises and smoke are not normal, under any "normal" circumstances.

 

Uh-oh... Metallic rattling noise in the engine is never good, nevermind when coupled with smoke and what not. My suggestion is to not drive the car and have it towed to a mechanic, preferably not the one who told you mystery oil was going to help you....

 

The oil additive had nothing do to with it. I use the Mystery stuff all the time, both in my oil and in my fuel system. My best gas mileage was obtained using that stuff in a tank of gas. It's a great top end and fuel injector lube.

It sounds like you have an internal engine problem. It was burning a lot of oil to begin with, the loud bang wasn't a good sign. Time to shop around for a new or used engine.

 

Marvel Mystery Oil is not a "snake oil"
it has been around for a loooong time, and not a bad product. It does what it says it does.

 

I have a buddy whos tranny was giving him a little slip. A mechanic told him to put in some type of tranny additive. He pulled it in the driveway put it in and the car never moved again...

Anyway, Hows your car doin boss?

 

I took it to a mechanic today, he said it's 90% likely that it's the A/C compressor, he let me listen with a st3thoscope, and its definetely making the noise that I hear.

He said the smell and smoke I had was from the clutch on the A/C compressor going out. He said he's gonna find out for sure on Monday.

Thanks for all your responses, I guess Mystery Oil is OK after all

 

The same thing happen to me, when the clutch locked up on my AC compressor, it was really smoking.
Melted plastic was oozng out the center.