Well they're back..... My truck is once again leaking vital fluids (oil and anti-freeze). Luckily I don't have to deal with fluids going away with dry pavement instead its getting quite wet. I'm not sure which is leaking more, oil or coolant, but its getting bad. Currently they don't leak a bit while driving and idling. It can sit there warming up for 10 mins and the ground remains totally dry, but when I shut it down and walk away for an hour or all night I come back to little dark spot of oil and coolant under the bumper and engine. Some times there is much larger spots. I can't seem to find where the leak(s) are coming from. There are no obvious spots that are damp on the block or radiator, at least not ones that I'm not already aware of. Two weeks ago the truck began to leak from an oil cooler line on the radiator, but the leak is small and as long as truck is kept under 2000 rpm it seems not to leak much at all. That's the only oil leak I know of, but it seems there might be more some where else. Where else is it common for late 90's trucks to leak oil. I have a new rear main seal and oil pan gasket on the truck as well as brand new cooler lines and fittings, I also replaced the filter to block gaskets. I currently run Pennzoil reg 5w-30 and a Fram Tough Guard filter. I'm due for an oil change soon and may have the shop look around under the truck, I will be upgrading to Mobil one synthetic and be trying out a Delco filter (this may make the leaks more significant). I think one of my water pump to heater hoses are leaking and I have the replacement, but can't replace it with out removing the EGR valve which a clamp is stuck on. None of my other hoses on the radiator or pump seem to be leaking, but I'm losing coolant quickly refilling the reserve every two weeks, but the level in the radiator doesn't seem to drop much. The radiator is brand new so are the upper and lower hoses, thermostat, and radiator cap. Minus the oil cooler fitting leaking oil the radiator is great. The rest of the cooling system is factory. I really need any ideas you guys have because this is getting insane.... The truck now only drives short in town trips because I'm scared to drive her too far. I really need this old girl in top shape before this summer because it's my vehicle for driving to college and back on holidays and such. Every other part of this truck is solid as a rock.