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Synthetic oils are known to cause a wet-clutch to be in its friction zone longer. If someone studies Honda Owner's Manual, it appears that Honda figured that out too. For example, from 2001-03, Honda had no synthetic oil. Their Owner's Manuals suggested GN4, Honda's conventional oil. However, by 2004, Honda began marketing their new HP4 semi-blend. In the Owner's Manual was even a full page picture of their new oil with strong suggestion to use it. The HP4 bottle even had the words "engineered for GoldWings" on its label. By 2007, Honda came out with their full synthetic HP4S oil, and the words "engineered for GoldWings" was removed from their blended synthetic, and now the Owner's Manuals were strongly suggesting their new full synthetic.
As time past, and I think on or about 2010 or 2012, their suggestions to use synthetic oils no longer existed, and it was then back to their GN4 10w-30.
Below is a picture of burnt clutch plates. He reports using a synthetic oil.
For 6th gens, Honda has strong wording suggesting their conventional oil GN4 10w-30.
As time past, and I think on or about 2010 or 2012, their suggestions to use synthetic oils no longer existed, and it was then back to their GN4 10w-30.
Below is a picture of burnt clutch plates. He reports using a synthetic oil.
For 6th gens, Honda has strong wording suggesting their conventional oil GN4 10w-30.
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