lehman live edge slab
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Tc I think is the American two cycle air cooled oil cert but the Japanese certified “jasco” and the global “iso” standards have surpassed the tc certified oils by a pretty large margin. Jasco fd and iso lg Ed are almost equivalent standards and the iso lg Ed+ is slightly higher. So any of the three standards is pretty much the best you can get. And stihl ultra used to have a jasco fb rating on the bottle. Thought Castrol still made the orange bottle stihl.