"lbbss" wrote: (2002 Saturn sl1 80,000 miles)
I get a 1 or 2 inch diameter oil leak on my driveway every day.
The mechanic thinks it is likely the head gasket. Would some
oil additive, or a heavier oil slow down the leak, or is that bad
for the engine? There is no black smoke from my exhaust.
Ask your mechanic why he thinks it's the head gasket.
A bad head gasket almost always leaks coolant, not oil.
Find exactly what the dripping material is; oil, coolant,
trans fluid, PS fluid, washer fluid, AC condensation,...?
If it is oil, it could come from a valve cover seal, a crankshaft
seal, a timing cover seal, an oil filler tube joint, a drip from
topping off the oil carelessly, etc..
Get underneath and look up to see where it's coming from.
If you can't get under the car, open the hood and tighten
the valve cover screws. If that doesn't stop the leak, post
again, describing exactly where under the car the leak spot
appears. Someone here may offer a better guess as to the
source of the leak.
No additive or heavier oil will help.