If you look up under the front bumber you will see a plastic cover. Remove it and you will see the filter.
from the under side of the trail blazer you will have to remove the skidplate, the fiter is on the front bottom pasenger side of the motor
the oil sending unit is located right above the oil filter.
Just above the oil filter housing on the lower passenger side of the truck.
It should be located under the engine there an oil pan it's the only skew you can't miss it.
It is on the bottom of the engine.
The manual says 7 qts (u.s.) that's total including filter.
If you go to the front of you Blazer and look underneath the bumper you will find an access panel for your oil filter
thers a panel in the front underneth that says oil filter hatch 99'blazer lt 4wd
How to take off a nissan x trail oil filter
5 quarts
LF393
under the front middle of the engine, remove a access panel it has 2 screws holding it in place. Once you remove the cover you will see it