January 8, 200818 yr Is there any advantage/disadvantage in using semi or fully synthetic oil in the fuel premix and does it do any harm changing from one to the other?
January 9, 200818 yr Is there any advantage/disadvantage in using semi or fully synthetic oil in the fuel premix and does it do any harm changing from one to the other? Generally I've noticed no harm in changing from one to the other, providing they are major brand types. I usually recommend the full-synthetic oil as they tend to burn cleaner and I've measured less wear after engine teardowns. I'm using Castrol TTS currently and all indications are that it is working very well. When I lived in California, I used Rock Oil and really liked it but it's unavailable here in the Midwest. The "semi" synthetics are a blend and there's no indication exactly how much of the formula is synthetic, theoretically it could be 99% mineral and 1% synthetic. Jon
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