They should have a film of whatever fluid they are going to seal on them. Transmission O-rings should have ATF on them.
Brake O-rings should have Brake Fluid on them.
If it is something using Grease, Grease the O-rings.
And, so on.
The exception would be if you have some special O-ring Lube than can be used as the have for Brake Calipers.
The one place I worked during Fuel Injection Pumpy assembly we use a mix of 50% Motor Oil and 50% STP.
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84 300D, 82 Volvo 244Gl Diesel
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