1999-06 4.8 and 5.3 Ls engines and mileage

[mopower440]

I have a 1999 ecsb 4x4 with 4.8 and 3.73 gears, it has 210,000 miles on it and i just drove it from TN. to NY. and back, 1150 miles each way and drove it non stop, just stopping for gas. The truck was flawless and did not use a drop of oil. I have seen many many other trucks from this 1999-06 era with the ls engines with 200,000 to 300,000 miles still running perfectly, is this quite common for these LS engines to run this long and not even use oil? I was a little nervous on this trip with the high mileage but it never missed a beat. wondering because i am looking at a few 5.3 engines right now, want to swap a 5.3 in as the 4.8 is a little underpowered and the 5.3's im looking at all have around 100,000 miles on them, but if they are known for running 200-300,000 miles, then 100,000 is still new and i wont hesitate to get one with 100,000 miles on it. Has to be reliable as i travel some. I always thought these engines were known to burn oil but i havent seen that..
Thanks

[bstill]

My 4.8 has 190k on it and only uses a quart between changes. I wouldn't hesitate to buy one with a 100k on it. I'm thinking of going turbo and might get a 5.3 to swap in before I do. Thought about trying the 4.8 out first just to see if it'll last boosted.

[blacstar]

they are a good engine, 5.3/4.8 has the same block but longer stroke. make sure tho, you are buying a 5.3 (measure the stroke)

[CHEVROLADE]

Uncle has 385,000 miles on his 99 silverado 5.3

[stumpy]

I'm at 18x,xxx miles. Mine is leaking minor and eating oil but its about a quart when close to changing time. Still runs great. Just need to fix my ac. This 90 degree crap sucks

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[George C]

only real reason these motors use oil is cause of the PCV systems they use, when they are eliminated they use next to no oil

[demonheavymetal]

107,xxx+ on my '06 4.8 and still running better than new, even did h/c stall at 106,000 Melling oil pump and ls2 timing chain, its NEVER leaked or used a drop of oil....and I've been running crap outta mine daily too, stomp every ford or dodge (including cars) every chance I get

[Kansas T]

I sold my 2000 Silverado that had 298,000 a few months ago. It still ran great.

[mopower440]

what keeps the rod and main bearings and the roller bearings in the roller rocker and roller lifters from giving out with the high mileage?