Oil and water mix in the motor honda civic 94 model. What to do and What is the best sealant?

Head gasket

If the water and oil are mixing and the engine running hot it is either a blown head gasket or a cracked head.

Faulty blower motor resistor

Use green antifreeze that mixes with any type of antifreeze. A 50/50 mixture of antifreeze to water should work.

I wouldn't use other colors unless they say they mix with all antifreeze mixtures.

This has worked the best on my Hondas that I've owned over the years.

If you have oil and water mixed you have blown your head gasket and the damage is done. no sealant will help at this point. the engine has water in it and it will seize water in a engine is NOT GOOD.
you will have to get a local shop to replace the intake manifold and head gaskets. no doubt there.. find a reliable shop and cheap is not the way to go with this repair reputation and put in it their hands to put it back together right

head gasket is shot

sounds like you have major iternal engine i`d have it checked out by reliable technitian the fuel line or fuel filter blocking the fuel supply or fuel pump has gone out

If you go to a reputable motor factor,
you can only be sold the correct filter for the civic.
As there are soo many variables in engine type, it's almost impossible to tell, oil volume, or which type filter.
However, I will say, be sure that you don't mix semi-synthetic oil, and mineral oil.
Oil changes should be undertaken every 30,000 miles, (unless under extra work load, (in which case, slightly more regularly))

Otherwise, 10/40 or 15/40 grade oil, is perfectly fine.
The trick to not overfilling the oil, is simply just to take your time, clean the dip stick and retry, until you have the correct reading.

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It's possible that the thermostat is defective.
Also check that the overflow hose and resivour are not cracked.
Check the engine oil, if it looks foamy then you may have a cracked head.

hello , you can use ATF automatic transmition fluid , thank you for using fixya