My 2001 tahoe 300k miles original engine/transmision

[ReaperHWK]

I’ve had several vehicles all over 200k with no engine issues; IMO it all comes down to changing the oil every 5k with full synthetic. No miracles needed.

 

[V30Crewcab]

I made it to 296k on the original trans. had to tow it back home 1000 miles with my FIL's truck. trans rebuilt now. No plans to get rid of it. we'll see how far it will go.