Engine sounds like tek tek tek tek whenver it is running

DIESEL RUN AWAY, GOOGLE IT 100 YEAR NO SAME ANSWER.
it is burning it;s own oil pan OIL up past fully defective, Piston control rings bad or head valve seals.
it needs and over haul, ask in real truck or submarine, EM (eng mate)
.or pan whey to full or 0w oil used in old old engine.
29 years is good run nO? may be A record,

sticking hydraulic lifter ? oil & filter should be changed @ 3000 miles, but the level should be checked every gas fill-up, if you don't follow this maintenance , you are killing the engine, as far as possible causes of this failure , the owner !

just like to ask you a question. How often do you do oil change and what grade of viscosity do you use ?
For a good engine you must renew oil if you do long drive and depends what weather you do have every 5000 km, or 3000 miles. why that ? I did carry lots of tests according to oil change and found that any kind of oil you do use fully synthetic or semi synthetic, the oil gets burnt and cause carbon inside the engine and also like gum deposits which are closing slowly - slowly the ways of lubrication and especially the metallic filter in the sump which is picking up the oil sending it to the oil pump and filter and then to rest engine parts.
I personally believe you might have something like this.To try solving this problem buy a RESTORE ENGINE OIL FLUSH put it in your engine old oil and run the engine idle for 40 minutes ( the container states 15 minutes ) but personally use it for 40 min. and then change the oil with new less than what usually putting in e.g.5ltrs put 3ltrs remove the old filter drain it and screw it back on the engine and run engine for 15minutes and then renew oil and filter and put also in the oil an additive RESTORE FRICTION REDUCER,and drive it to see the difference. Good Luck.

Low oil pressure to hydraulic lifters or tappets.
Adjust rocker clearance/use heavy grade oil /try lifter free or cleaner

changing the oild depends on the oil you use. If you use regular oil then u need to change it every 3,000 miles. But if you use senthetic oil you can usually change it from every 6,000-9,000 miles.

read below on how to do that


Oldsmobile Alero 2004
Turn the ignition to ON, with the engine off. Fully depress and release the accelerator pedal slowly three times within five seconds. The reset is complete when you hear the chimes and the “CHANGE OIL” light goes out. If the light stays on and no chime is heard, you will need to repeat the reset procedure. Turn the key to OFF. If the “CHANGE ENGINE OIL” message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure.

if you need further information please feel free to let me know and i will be glad to assist you further. If this solution helped you then please feel free to rate the solution. Thanks, Midwest-tek

Sounds like a worn big end bearing. Not a disaster as you have caught it early. Drain engine of oil and remove pan. Remove spark plugs and disconnect battery. Undo big ends, fit new bearings, refit the big ends and tighten to specified torque. Might be an idea to also replace main bearings as a preventative measure whilst everything is open. The main journals on the crank are probably fine. Check the journal facings of the removed bearings and determine not only how much wear but the wear type. I would try using 5-40 (or 5 -50) fully synthetic multigrade oil but not change it so frequently (15K is plenty). These oils are thin when cold and help avoid high shear forces within the bearings at cold temperatures whilst keeping a good viscosity at high running temperatures - good for the more mature engine. Because they are fully synthetic they keep their properties for a very long time. Good luck

see if you have any oil level or pressure sensors. sometimes these can get gunked up. You may need a new oil pump. I suggest you start using a senthetic oil (valvoline,mobil 1 is reccomended) after u get the problem fixed.

Yes it is. On your newer vehicles the factory has set your oil change light to come on at 5k, due to the technology in semi synthetic oils. Mazda uses a semi senthetic oil from the factory. I still recommend changing your oil every 3k. You may also consult your owners manual for the recommended service interval and adhere to it. As long as you adhere to manufacturer recommendations and keep your oil change reciepts, you should be ok if anything were to happen.

what grade of oil do you have in it??? i would go with 5W30 if its low km around 150km or less. but if it has more i would use 10w30 but its recremmended that u use 5w30 and i would try a senthetic and a bottle of lucus enging oil treatment