Here are some tips:
Start= You want to hit hard on the western side of the level, as many enemies can be seen running towards you at the start. Use topography to your advantage by taking over the west hill and taking down enemies in the middle of the map . Watch out for the ADATS there, by always moving unseen from it (behind rocks). Blow it up and continue to go along the western wall. You'll also be able to take out terrorists in their encampment from afar once you're up the hill.
Depot (entering) = You can go through the depot coming from the encampment. However, I prefer going through the big hangar that is in front of the depot (watch out for terrorists in there), because from there you can shoot most enemies that are in the open. If you want to get there, backtrack and approach the depot from the front.
Tanker = I usually blow the tanker without seeing it. I approach the train wagons and throw grenades to the tanker while staying behind cover. Using smoke to create cover is also a great idea, but I played the map with only 1 other player, and we didn't want to bring smoke. Once you know the level, you'll know where and how far you have to throw the grenade to blow the tanker. This is important because terrorists will start pouring to this location, so you want to be in range of good cover for the next part. By staying hidden in front or behind the train, you can kill them without risking your life. The worst place to be when the tanker blows up is in the open in front of it or between the 2 trains (although sometimes luck is on your side ...)
The rest of the level is a straightforward clean up to the extraction.