I have been having good luck with Klotz R50. I have been using it for about 4 years now and during top end checkups / freshenings I am impressed at the significant oil film on all of the parts and the effort needed to clean it off. I have not found comparable oil films using Yamalube, Golden Spectol, Mobil MX4 and Redline Waterpumper. It smells great too!
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