diff --git a/src/applications/differential/editor/DifferentialTransactionEditor.php b/src/applications/differential/editor/DifferentialTransactionEditor.php
--- a/src/applications/differential/editor/DifferentialTransactionEditor.php
+++ b/src/applications/differential/editor/DifferentialTransactionEditor.php
@@ -1536,7 +1536,6 @@
 
     $xactions = array();
     if ($auto_subscribe) {
-
       $xactions[] = $object->getApplicationTransactionTemplate()
         ->setAuthorPHID($owners_phid)
         ->setTransactionType(PhabricatorTransactions::TYPE_SUBSCRIBERS)
@@ -1546,11 +1545,97 @@
           ));
     }
 
-    // TODO: Implement autoreview and autoblock, but these are more invovled.
+    $specs = array(
+      array($auto_review, false),
+      array($auto_block, true),
+    );
+
+    foreach ($specs as $spec) {
+      list($reviewers, $blocking) = $spec;
+      if (!$reviewers) {
+        continue;
+      }
+
+      $phids = mpull($reviewers, 'getPHID');
+      $xaction = $this->newAutoReviewTransaction($object, $phids, $blocking);
+      if ($xaction) {
+        $xactions[] = $xaction;
+      }
+    }
 
     return $xactions;
   }
 
+  private function newAutoReviewTransaction(
+    PhabricatorLiskDAO $object,
+    array $phids,
+    $is_blocking) {
+
+    // TODO: This is substantially similar to DifferentialReviewersHeraldAction
+    // and both are needlessly complex. This logic should live in the normal
+    // transaction application pipeline. See T10967.
+
+    $reviewers = $object->getReviewerStatus();
+    $reviewers = mpull($reviewers, null, 'getReviewerPHID');
+
+    if ($is_blocking) {
+      $new_status = DifferentialReviewerStatus::STATUS_BLOCKING;
+    } else {
+      $new_status = DifferentialReviewerStatus::STATUS_ADDED;
+    }
+
+    $new_strength = DifferentialReviewerStatus::getStatusStrength(
+      $new_status);
+
+    $current = array();
+    foreach ($phids as $phid) {
+      if (!isset($reviewers[$phid])) {
+        continue;
+      }
+
+      // If we're applying a stronger status (usually, upgrading a reviewer
+      // into a blocking reviewer), skip this check so we apply the change.
+      $old_strength = DifferentialReviewerStatus::getStatusStrength(
+        $reviewers[$phid]->getStatus());
+      if ($old_strength <= $new_strength) {
+        continue;
+      }
+
+      $current[] = $phid;
+    }
+
+    $phids = array_diff($phids, $current);
+
+    if (!$phids) {
+      return null;
+    }
+
+    $phids = array_fuse($phids);
+
+    $value = array();
+    foreach ($phids as $phid) {
+      $value[$phid] = array(
+        'data' => array(
+          'status' => $new_status,
+        ),
+      );
+    }
+
+    $edgetype_reviewer = DifferentialRevisionHasReviewerEdgeType::EDGECONST;
+
+    $owners_phid = id(new PhabricatorOwnersApplication())
+      ->getPHID();
+
+    return $object->getApplicationTransactionTemplate()
+      ->setAuthorPHID($owners_phid)
+      ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
+      ->setMetadataValue('edge:type', $edgetype_reviewer)
+      ->setNewValue(
+        array(
+          '+' => $value,
+        ));
+  }
+
   protected function buildHeraldAdapter(
     PhabricatorLiskDAO $object,
     array $xactions) {
diff --git a/src/applications/owners/storage/PhabricatorOwnersPackage.php b/src/applications/owners/storage/PhabricatorOwnersPackage.php
--- a/src/applications/owners/storage/PhabricatorOwnersPackage.php
+++ b/src/applications/owners/storage/PhabricatorOwnersPackage.php
@@ -71,13 +71,12 @@
       self::AUTOREVIEW_SUBSCRIBE => array(
         'name' => pht('Subscribe to Changes'),
       ),
-      // TODO: Implement these.
-      // self::AUTOREVIEW_REVIEW => array(
-      //   'name' => pht('Review Changes'),
-      // ),
-      // self::AUTOREVIEW_BLOCK => array(
-      //   'name' => pht('Review Changes (Blocking)'),
-      // ),
+      self::AUTOREVIEW_REVIEW => array(
+        'name' => pht('Review Changes'),
+      ),
+      self::AUTOREVIEW_BLOCK => array(
+        'name' => pht('Review Changes (Blocking)'),
+      ),
     );
   }
 
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -1577,6 +1577,14 @@
       $type = $xaction->getTransactionType();
       if (isset($types[$type])) {
         foreach ($types[$type] as $other_key) {
+          $other_xaction = $result[$other_key];
+
+          // Don't merge transactions with different authors. For example,
+          // don't merge Herald transactions and owners transactions.
+          if ($other_xaction->getAuthorPHID() != $xaction->getAuthorPHID()) {
+            continue;
+          }
+
           $merged = $this->mergeTransactions($result[$other_key], $xaction);
           if ($merged) {
             $result[$other_key] = $merged;