I use 15x40 with the API "L" rating. Before long that won't be possible and I'll have to use "M" oil since about everyone isn't making L oil any longer. Some use 10x30 some use straight weight oil. The reason I said to do a search is this issue has been beat to death in the past.
Save a life, adopt a senior shelter pet. The three main causes of blindness: Cataracts, Politics, Religion. Name your dog Naked so you can walk Naked in the park.
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