unfreezing a stuck up engine

Been discussed a lot but there are always new folks asking

A cleaning out of all fuel with a dose of After Run Oil is the best preventative

Marvel Mystery oil additive for fuel systems is NOT the oil to use...Marvel Mystery AIR tool oil is an excellent after run oil as is ANY other cheaper brand of Air tool oils as they all have anti corrosion inhibitors and water displacing additives. MM Air tool oil at O'Reilly is $3.49 for 4 oz...Campbell Hausfeld Air tool oil is $2.99 for 8oz

Do NOT mix your own after run oil with ATF unless you know the ATF does not have friction modifiers... in other words not all ATF are the same

For frozen engines I have a very small $9.99 Walmart crock pot that has a high and low setting...in it I have about a pint of store brand cheap antifreeze....you could use just about any solvent that is plastic friendly including water and dawn dish soap...I have not found one 20 to 40 year old frozen engine yet that an over night soak on low temp in antifreeze would not cure

!! Caution!! Anti Freeze is bad mojo for your pets and not real good for you so do not stick your face over the boiling steaming fumes and use latex or non latex gloves when you rinse the engine off in water...and obviously after this operation the crock pot should not be used for food until you know the ceramic is absolutely cleaned...kinda why I bought a $10 one for my hobby shop

I also have an inexpensive ultrasonic cleaner from e-bay (less than $50) that will hold up to a .90 sized engine..I use water and Dawn, or 91% denatured alcohol..

15 min (with no heat) in 91% alcohol will free up most rusty or hardened castor frozen engines. My ultra sonic cleaner has a heat function that I do NOT use with high evaporation solutions like alcohol.

!!! Caution with using denatured alcohol.... take engine out immediately after cleaning!!!

If you throw the entire engine in, you have different metals in the Ultra Sonic cleaner, like a aluminum case, ABC, AAC, or ABN liner, steel screws, bronze bushings etc.  If you leave the engine and parts in the cleaner over night the aluminum case will discolor badly from electrolysis or galvanic interaction with all the dissimilar metals...including the stainless steel of the cleaner bowl
I have one very ugly engine learning this the hard way

And to be true to this forum there is a following for using a Gun Cleaning solvent called Hoppes number 9 that is easy on plastic and very good but can be it a tad expensive if you cannot find the pint or quart containers...Hoppes also smells very good to most of us gun nuts