MMO additive

I added a pint of marvel mystery oil to my truck and the engine blew up. Lol jk.

I am about to get my oil changed so i added this just for a few hundred miles. I’m having a little rough idle at start up during the cold mornings here in SC the past couple weeks. Very very slight knock while warming up. So i added the MMO to see if it would help. Anyone have luck with this before?

Also on a different note I wanted to check the color of my tranny fluid to see if it looked dirty so in accidentally drained the equivalent of about a measuring cup. 1 cup ish. Is that going to hurt anything? How much fluid does the transmission hold?

 

I would think a rough idle would come from your ignition / air / fuel ... less likely to be related to something that will be cleaned by your motor oil additive.


See here for more info on Trans:

https://www.tacomaworld.com/threads/diy-full-flush-for-automatic-transmission.68462/

 

Thanks for the info. So sounds like i shouldn’t worry about a cup of tranny fluid.

The slight knock would possibly be from something besides inside the engine? Should I change the plugs?

 

Maybe I read your post wrong but I thought you were attributing the knock to the rough idle. I know 0 about your maintenance history so cannot advise whether or not you should change the plugs. I would suggest bringing everything up to date maintenance wise, clean the MAF, air filter, fuel filter if it is due, etc.

 

My biggest concerns were A. Did I overfill oil with a pint of MMO and B. Did I lose too much tranny fluid with a loss of a few ounces.

 

Check your oil level with the dipstick and add the appropriate amount of transmission fluid and check via the methods in that linked thread above or the one I attached?

Yes, your oil is more full then it was. Does the dipstick register that it is overfull? Only you can tell us that.

It's only a half cup, so you likely won't have any transmission issues. Does it shift OK?

Since you know you're likely short transmission fluid, you might as well just do a drain/refill of the transmission one of these days. https://www.tacomaworld.com/threads/how-to-drain-refill-automatic-transmission.63851/

 

These dipsticks are hard to read. Oil all over it. Looks ok. I’ll send pic later. That’s what I was thinking about tranny. Flush and fill pretty soon. Shifts ok now. Don’t have a dipstick for tranny so no way for me to check. Compared to my old POS Ford Explorer this thing shifts like a Ferrari.

I’m hoping the mmo will help with the ever so slight knock. Maybe it’s nothing to worry about.

 

? Wipe the dipstick off and recheck the oil using the dipstick in a lighted area. I really don't want a picture of your dipstick.

The two linked threads have detailed instructions on how to check the transmission fluid level. I agree that a dipstick for the transmission would be helpful, but the current method is easy enough.

Depending on mileage/maintenance intervals, I would just do routine stuff on the truck as mentioned above with the exception of the fuel filter as that is not easily servicable.

 

I would not add any oil cleaning additives to your car. They just aren’t needed. This is 2018 not 1950. Oil and especially gas has so high standards, it’s not going to gum up your engine. You just risk causing another issue with the truck.

You drive a 2011 Tacoma that has actually been driven... the transfluid is obviously going to be dirty. Not sure why you needed to know this. If there are over 100k miles on the truck, do a trans flush regardless of what the fluid may look like.

Sounds like the truck may be used but new to you? No service history?

I would have someone check the computer for any precodes. See if there is anything that might indicate the knocking.

If it is a new truck you... just change all the fluids for peice of mind. Just easier.