i drive my dad's 98 gmc savana van 1500 it stated knocking my dad said. i ckecked

[shannon p]

the oil.it smelled like gas? looked like like coffee with cream .what do i need to do change the oil. or is there any hope? what does this mean it has not knocked before this we have not drove it since

 

[bandit_60]

you need to change more then the oil. you need to change the head gasket. anti-freeze is,nt too good on bearings either.

 

[Hex T.]

Fuel is getting into your oil!

There are many causes to this.. but all requires one job to be done...
ENGINE OVERHAUL.... which is really costly. I'm sorry to fright you.

The possible causes ;-
i ) busted piston rings
ii ) damaged pistons
iii ) a busted PCV hose (positive Crankcase Ventilation)
iv) Cylinder head gasket went off

 

[alex b]

It is a blown head gasket. A very costly repair. If the repair cost is more than the car itself, I would buy another car. Good luck.