I havent been able to find the informtion here, although Im sure it is on the forum somewhere. Does anyone have the fluid capacity amounts and change intervals for a 1999 2500 6.5 Suburban? Does the Haynes manual cover this pretty well or do I need to go by the owners manual? Thanks.

Owners manual is what I start with, but always check on the dip stick to be safe.

Mine takes 7 quarts of 5w50 Syntec, change the filter @ 5K and Oil and filter every 10K.