From reading this thread the consensus seems to be that Cool Power Gold (Medium OR Lite) is a good oil to use for MSA Legal GX160's. Due to the viscosity of Cool Power and, as already pointed out above, there is no oil filter in the GX160 engines, you should change regularly.
You can do up to a 6 hour race with CP but anything above that you should look into a suitable alternative oil (be that synthetic or mineral), bearing in mind that it needs to be designed to protect a splash fed engine.
We've used Cool Power Mediium and Lite and have had no problems and would recommend the oil; the key is to just change regularly... but you should do that regardless of what oil you use.
Hope that helps.
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