diff --git a/server/gameserver/car.cc b/server/gameserver/car.cc
index 213d3896..889ac73f 100644
--- a/server/gameserver/car.cc
+++ b/server/gameserver/car.cc
@@ -381,7 +381,7 @@ void Car::SetAttackDir(const a8::Vec2& attack_dir)
 
 void Car::DecOil(float dec_oil)
 {
-    dec_oil *= 1 + GetAbility()->GetAttrRate(kHAT_CarOil);
+    dec_oil *= 1 - GetAbility()->GetAttrRate(kHAT_CarOil);
     cur_oil_ -= dec_oil;
     cur_oil_ = std::max(0.0f, cur_oil_);
     if (!HasOil()) {