diff --git a/src/data/layers/oil.tsx b/src/data/layers/oil.tsx
index 2fbbb29..a50658f 100644
--- a/src/data/layers/oil.tsx
+++ b/src/data/layers/oil.tsx
@@ -246,7 +246,12 @@ const layer = createLayer(id, function (this: BaseLayer) {
             .mul(activeHeavy.value)
             .mul(Decimal.add(activeHeavy2.value, 1))
             .mul(activeExtractor.value)
-            .mul(depth.value)
+            .mul(
+                Decimal.pow(
+                    depth.value,
+                    management.elfTraining.oilElfTraining.milestones[0].earned.value ? 1.2 : 1
+                )
+            )
             .div(1e5)
     );
     const buildPump = createBuyable(() => ({
@@ -752,6 +757,16 @@ const layer = createLayer(id, function (this: BaseLayer) {
             description: "Guide to drilling",
             enabled: paper.upgrades.drillingUpgrade.bought
         })),
+        createMultiplicativeModifier(() => ({
+            multiplier: () => Decimal.add(totalOil.value, 1).log10().add(1),
+            description: "Cocoa Level 2",
+            enabled: management.elfTraining.oilElfTraining.milestones[1].earned
+        })),
+        createMultiplicativeModifier(() => ({
+            multiplier: 2,
+            description: "Cocoa Level 3",
+            enabled: management.elfTraining.oilElfTraining.milestones[2].earned
+        })),
         createMultiplicativeModifier(() => ({
             multiplier: () => coalEffectiveness.value,
             description: "Effectiveness",
@@ -810,6 +825,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
             multiplier: () => Decimal.add(buildHeavy2.amount.value, 1).sqrt(),
             description: "Faith Level 4",
             enabled: management.elfTraining.bonfireElfTraining.milestones[3].earned
+        })),
+        createMultiplicativeModifier(() => ({
+            multiplier: 2,
+            description: "Cocoa Level 3",
+            enabled: management.elfTraining.oilElfTraining.milestones[2].earned
         }))
     ]) as WithRequired<Modifier, "description" | "revert">;
     const computedOilSpeed = computed(() => oilSpeed.apply(0));
@@ -1023,6 +1043,9 @@ const layer = createLayer(id, function (this: BaseLayer) {
             if (oilMilestones[1].earned.value) {
                 upgrades.push(row2Upgrades);
             }
+            if (management.elfTraining.oilElfTraining.milestones[4].earned.value) {
+                upgrades.push(row3Upgrades);
+            }
             return (
                 <>
                     {render(trackerDisplay)}
diff --git a/src/data/layers/plastic.tsx b/src/data/layers/plastic.tsx
index c8b7121..de55ba3 100644
--- a/src/data/layers/plastic.tsx
+++ b/src/data/layers/plastic.tsx
@@ -27,7 +27,7 @@ import {
 import { noPersist, persistent } from "game/persistence";
 import Decimal, { DecimalSource, format, formatWhole } from "util/bignum";
 import { render, renderCol, renderRow } from "util/vue";
-import { computed, ref, unref } from "vue";
+import { computed, ComputedRef, ref, unref } from "vue";
 import boxes from "./boxes";
 import metal from "./metal";
 import oil from "./oil";
@@ -63,7 +63,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
     ));
 
     const activeRefinery = persistent<DecimalSource>(0);
-    const oilCost = computed(() => Decimal.times(activeRefinery.value, 100));
+    const oilCost = computed(() =>
+        Decimal.times(activeRefinery.value, 100).times(
+            management.elfTraining.oilElfTraining.milestones[3].earned.value ? 5 : 1
+        )
+    ) as ComputedRef<DecimalSource>;
     const buildRefinery = createBuyable(() => ({
         resource: metal.metal,
         cost() {
@@ -230,7 +234,10 @@ const layer = createLayer(id, function (this: BaseLayer) {
 
     const plasticGain = createSequentialModifier(() => [
         createAdditiveModifier(() => ({
-            addend: activeRefinery,
+            addend: () =>
+                management.elfTraining.oilElfTraining.milestones[3].earned.value
+                    ? Decimal.times(activeRefinery.value, 5)
+                    : activeRefinery.value,
             description: "Oil Refinery",
             enabled: () => Decimal.gt(activeRefinery.value, 0)
         })),