Hi, my question concerns a 1999 Chevy Express G2500, it's got pretty high miles 270,000 or thereabouts. A few weeks ago I cranked her up and there was a loud noise like an unbalanced washing machine (a heavy knock/scrape sorta) I jumped out and looked under the body to find oil shooting out everywhere: blown gasket on the oil filter. I replaced the gasket and added oil, but the sound would still persist for a minute or so when I start the engine on a cold morning, but after a day or two went away. Then yesterday morning the sond returned, once again lasting only a minute or so on a cold start, but I checke dthe oil upon arriving at work to find that I was a quart or so down. Not good. I added oil, but the sound is still occurs. Also, since the sound has been back, when I first sccelerate in the morning, the oil pressure shoots up to the top of the gauge, 80 pounds or so, ugh. After a few minutes of driving (when the engine warms) it seems to stabalize out to normal levels. Though the water pump was replaced about a year back, there seems to be a new coolant leak somewhere, though I can't seem find any evidence on the ground either at work or home. Help!