Cat 257b2 using oil

Looking for some guidance....I have a 2008 Cat 257b2 with 2500 hrs. Recently purchased, have run for 85hrs. since purchase during which I have added 3.5 quarts of oil. Dealer wasn't necessarily concerned, said Cat tracked acceptable usage by oil compared to amount of fuel consumed. He also mentioned that he remembered something about dipsticks that had incorrect indicators but didn't recall which models/years and would get back to me. I believe he was trying to say that I may have to much engine oil and it's burning it down to the appropriate level. Seems like engine is producing good power, no visible smoke at any rpm. It's doesn't leak any oil. Appreciate any thoughts you have.

Thanks.

Cat 257b2 using oil