Engine longevity?

[Dirk Diggler]

stock 2004 Yukon SLT 5.3L with 202,000 on the clock (bought new, only used synthetic oil, change tranny fluid every 30k)

 

[mattluttrell]

stock 2004 Yukon SLT 5.3L with 202,000 on the clock (bought new, only used synthetic oil, change tranny fluid every 30k)

You sound like me.

Do you do full fluid swap at radiator? Which fluid do you use?

0w40 in engine?

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[Dirk Diggler]

You sound like me.

Do you do full fluid swap at radiator? Which fluid do you use?

0w40 in engine?

Full swap @ radiator. Usually synthetic or maxlife. Only use 5w30. Mainly M1 or Napa Syn. Currently running castrol semi-blend 10w30 that I got at auto zone when it was $1/qt.

 

[ulakovic22]

As stated above, these engines go on forever. 200K miles is very common and you shouldn't be concerned with anything that is just over 100K. Getting one with over 100K should net you a nice drop in price too.

 

[mattjones]

I have a stock 2000 Z71 w/ 5.3 with 198,*** miles. Doesn't smoke, use oil, make odd noises, etc etc. Never had a single problem, even the transmission and transfer case are untouched from the factory. I pull a 20ft pontoon on a 100mi round trip the lake 10-15x a year too. I've always used either Mobile 1 or Supertech synthetic motor oil (6k mile oil change intervals) and changed the transmission fluid and filter every 50k miles.

Two 5.3s around my area have the same mileage or more. One I think has around 240k with no problems.

These engines are very tough if properly taken care of. I've noticed the transmissions like to go out around 150-170k miles, but I think mine has lasted so far since I've always changed the trans fluid/filter every 50K.

If I knew the history of the truck (owner, maintenance, etc.), I wouldn't have a single problem buying one with 130k. These things will last. Even Ford builds a good one... my dad has a 2001 F-150 5.4L with 260k miles and she still runs like a top. Eats about a quart of oil every 5k miles, but still runs good and doesn't smoke.

Do you completely change the transmission fluid or are you just dropping the pan and replacing 5 quarts or so?

 

[ccapehartusarmyINF.(ret)]

my 5.3 has 221k and still purrs like a kitten

 

[StockHoe]

Almost at 260K in a 2007 5.3 with original trans and motor.