99Bosch HSE 162K Drinking coolant like a fish. Well, no puffs of steam when cranking, neg on CO2 in coolant,no evidence of coolant in oil ( oil is honey color) no drips anywhere outside, heater core o-rings good and dry as dust in floor, just took off valve covers last night and mega mayonnaise on the roofs of both covers. Runs great but I have to refill coolant tank once a week or about 300 mi. WHAT THE HECK IS GOING ON??????