When is the time to replace the AT Flued of my Isuzu MU? Do I need to replace them every time I do the change oil of my engine?

4jg2 IS ONLY AND ENGINE by ISUSU see in (wiki magic) DIESEL engine it is !

The 4JG2 is an indirect injection engine. It replaced the 4JB1-T in the Isuzu Bighorn (Trooper II) and Mu/Wizard (Rodeo) in most markets.[44] This engine was upgraded from mechanical injection to electronically controlled mechanical injection.

nol car told but smoke , but not told where the spark comes from.
engine bay
rear tail pipe
broken exhaust parts.

if injection fails to end key off, that is very very serious problem
called RUN-AWAY where the engine eats its own oil pan oil.
bad piston rings top cause.

What is a MUX??

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that is not the first question that be , which engine option
never post eng. questions, lacking that, because we cant guess.
and why not say what is wrong, or symptoms.??????

No Vehicle made tells you when to change the oil

You will be told that by a dealer & professional
mechanics

Those type warnings & lights you get, are nothing
more than gadgets. They are usually reset so your
not concerned about it being lite

Just set up a schedule of your own, on oil changes
& keep a log book

If you use the car 5 days a week to go to work,
then you need to change your oil at least 4 times
a year, on ALL Vehicles

Never go over 4000 to 4,500 miles,that is about every 12 weeks

If you are hearing a loud "knock" and it is coming from the bottom of the engine you probably have a bad crankshaft bearing(s) which means engine rebuild or replacement.

can assist with master cylinder and slave cylinder layout isuzu bighorn bj2

you may need special tools,take tp expert,hate to do job twice over

Don't know the USA system but here in Europe the sister car with the same engine does 13 liters per 100 km on city, 9 l / 100 km on road and 12 l / 100 km on highway.

If you mean engine oil?, Check the dipstick, to see how much oil you have all ready in the engine.
On the dipstick you will see two marks or notches on the stick, the level of oil in the engine should be in between the two marks or notches. Do this with the engine turned off at all time.

I hope this as helped!

valve guides worn and tappet adjustment required, can check tappet adjustment first to see slightly better before removing heads and getting valve guides repaired/replaced on heads common problem
if raise revs to 1500-2000rpm and hold does clatter come and go come and go (valve guides) if there all the time tappet clearance issue
if there only under load (1st rev up) for a couple of times then stops possible big end bearing
all these are common for this engine