HEY GUYS AND GALS NEW HERE SAYOING HEY A LITTLE ABOUT ME...IM FROM PRINCE GEORGE b.c. CANADA AND I RECENTLY BOUGHT A MAZDA B220 1992 AND IT WAS OVER HEATING SEEMS TO BE OK NOW BUT IT BURNS BLUE AND I DONT KNOW **** ABOUT ENGINES COULD SOMEONE GIVE ME SOME ELP PLEASE??

 

Burns blue? Check, and keep checking your oil level. It's burning it. The piston rings are worn and going bad.
You don't say how many miles are on the truck or how it was used, but my guess is that it was not taken care of very well (i.e. regular oil/filter changes) and it's coming close to complete rebuild time.

 

I'd recommend doing a compression check on each cylinder. (small gauge that screws into spark plug holes.)

Remove 1 plug, screw in comp gauge and have someone crank the engine while you read the gauge (remove the coil wire to avoid firing the engine up.) Do this 1 cylinder at a time and see if there is variation cylinder to cylinder, or very low readings.

If it's burning blue all the time, I agree with V1 - Piston rings are most likely worn and allowing oil to come up from the bottom of the engine. If it burns blue on start-up, I'd think valve stem seals.

 

Yup! But based on your post, I took it that it burned blue all the time.
To take SST's post one step further: When doing the compression test if you do find that one or more cylinders read low compression, squirt a couple of drops of oil in there and repeat the test. Not a lot, mind you, just a little bit. If you get a significant increase in compression, that's your problem. If not, then you may have a burnt valve in that cylinder too.
Also, I have found it easiest to do a compression test with all the plugs out and cylinders electrically deactivated, as SST suggested. But be sure to remove and GROUND the coil wire. Don't just let it flop around. It's hard on the coil (infinite resistance) and you may get a charge you never asked for otherwise.

 

aight thanks guys and there is 150000 on it