I changed the oil in my 1991 Mazda B2200 with a manual and a carburetor, and the next time I started it, I heard a new tick and a lot of blue smoke coming from the exhaust. I used 5W-30 oil, and I am within range on the dipstick. I am very confused about what is causing this and how to fix it. I am wondering if anyone knows what is wrong?

 

The act of doing a simple oil and filter change and you choice of oil should not have caused that.
Did you do any other service besides the oil and filter change?
Blue smoke (excessive gas &oil mixed in the combustion chamber)if it continues mean getting out the compression tester and doing a dry and wet test.
You can also pull the spark plugs and have a causal look at them although most spark plug inspections like that are generally inconclusive.
The only other thing is for some reason you flooded the combustion chambers right after or directly before the oil and filter service.


You just need to post more "detailed" information.....


Or wait for our couple of senior members that "hobby" these Mazda models so more almost daily experience levels...

 

If it didn't blown smoke before and it's now subsided guesing but could you may have got oil into a crank breater or PCV pipe? Seen that happen before but I don't know your engine design. The ticking best post up a short video.

 

5W-30 may be too thin of an oil for these trucks........unless it never gets above freezing where you are driving the truck.

 

I'm in Arizona, and I use conventional 10W-40 from Walmart in my '88 B2200. After I change the oil or add 1/2 quart, I do notice some smoke from my exhaust for the first minute, especially the first week after. I'm just used to that now.

But I don't get engine ticking.

My engine was rebuilt in 2020, about 20K miles ago.

 

Smoke after changing the motor oil is generally caused from a *cylinder glaze or worn out engine.
A cylinder leak down test may reveal which.
Or at least scoping the cylinder will revile often times thing an owner does not want to know. LOL
The viscosity used is a clue to that. An engine in mechanical sound order having to do with the cylinders is directly influenced by viscosity of the oil.

* I might add and ONLY as a DIY response in this case that an Italian Tune-up has shown to break a cylinders glaze and help with better compression and oil control. Perform the Italian tune-up at your own risk!