"TECHLINE SUMMARY ARTICLE - IF THE ENGINE IS OVERHEATING AND THEREÂ’S ENGINE OIL MIXED IN THE COOLANT RESERVOIR, CHANCES ARE THE CYLINDER HEAD MAY BE CRACKED. A CRACK MAY FORM UNDER THE FRONT AND/OR REAR CAMSHAFT AT THE JOURNALS AND IS A RARE OCCURRENCE.
YOU CAN SEE THIS CRACK FROM VISUAL INSPECTION. IT CAUSES ENGINE OIL TO ENTER THE COOLING SYSTEM AND COOLANT TO ENTER THE ENGINE LUBRICATION SYSTEM."