Snubber Network Over a Switch
Snubbers are only used to absorb inductive and motor Back EMF now acting as a generator when turned off.

In this case the tungsten lamps have a PTC effect of about 1:10 ratio in Ohms and 10:1 in power when turned off so the surge may start at 90A then reduce to 9A when white hot.  For this reason the relay contact current rating must be reduced to handle the turn on surge. Depending on contact quality with silver alloys perhaps with tungsten or titanium added to alloy plating to withstand high arc temps from contact bounce if that exists. 

It may need to be at least rated for 25A or more. MTBF is greatly affected by number of cycles and surge current.  Omron has app notes and MTBF specs on this application. (Not handy)

Typical use is turning on low beams and thus much less current and going from low to high beam is less of a surge since the filament will already be warm so perhaps 1:5 change in high beam R . 

The contacts can handle surges greater than ratings but frequency of switching and over current ratio are factors car manufacturers decide on what relay to use and who is qualified to meet those conditions.

Conclusion:

Choose a more reliable automotive relay for lamp surges. Much higher current rating and better contact alloy.

Lookup datasheet contact materials.

Omron and TE recommend : AgSnO2 in special cases: AgNi20 or
Tungsten pre-contact