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Probably a blown head gasket.
Any 10W-30 oil meeting the API-SM specification is recommended for the 1995 Volvo 850.
I need to no how to remove oil pan
10W30 if you get winter. If you dont get winter then 10W40.
The recommended oil grade is 10W/30.
Use only the weight recommended by Volvo and I doubt that they recommend 10w40.
Bad head gasket
5.6 US Quarts (5.3liters)
10w30 is recomended.
Oil mixing with coolant? Coolant mixing with oil? Low compression on 2 adjacent cylinders? White smoke from exhaust when engine is hot?
5.5 quarts of oil meaning 5 1/2 bottles of oil.
Are you sure it is not transmission fluid? Oil in the coolant would indicate a bad head gasket