1998 C70 2.5 Auto - petrol in oilpan

[cgimec]

hi all,

a week ago I found something like coffee milk on the oil dipstick. I assumed it was condensation, as the car wasn't driven on long distances for a while. I still had oil on the dipstick. today I took the car for a 60 miles journey. I assumed if there was water, it would evaporate and the leftovers would be oil. well, the theory is wright, but I assumed wrong. it's not water and now I have cappuccino and no oil it smells like exhaust gases, so it's petrol mixed with oil. nice color, though. to keep her alive and not to damage anything more than already is, I'll schedule an oil change with a thicker oil and I'll add some additives. this will buy me some time to see if the issue is real or it was just too much water.
the car starts and drives without any problem. no blue smoke, no white smoke. it pulls and accelerates as usual. no errors.

it could be a faulty injector, a faulty head gasket but the coolant level is normal (this could be bad but not as bad as the next two faults), piston rings (engine rebuilt, here I come) or a cracked block.

did I mention the car has only 72K on it, always serviced at regular intervals by volvo dealership? I've done 13K with her without any major problems.

now, what options do I have? I'll have the compression and the injectors tested, but is it worth an engine rebuild? if it's the head gasket, then it could be 50/50 with the cracked block. any other possible faults, like in the old good carburetor days?

thanks.