Hi Guys,
My '74 4/4 has the crossflow engine/twin choke Weber carb with a black foam mesh filter.
How often should it be cleaned? I do not live in a particularly dusty environment and I rarely take it out bush

After cleaning this, is there a particular oil that I should use or will any engine oil do?
How saturated should it be?......obviously not dripping but conversely do I squeeze out all excess?
As always, many thanks for any advice.
Cheers,
Neil.