I use strait 30wt in our tractors all year.Really have had no problems with them. In very cold weather . I let them warm up for a few min. before working them. Make sure you oil is made for use in L P G engines. I do not know if "Low ash" oil is made any more . It was refined for L P G engines. Where are you located at? And how cold are your winters? I am in central Ok. clint
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