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Most warranti
Most warranties are invalidated if you don't use the dealers or manufacturers oil, and an oil lab can tell the difference. A bit different if it's an extended warranty. A good major brand oil is only 5 to 10 quid more for 5 liters than supermarket oil, and I can't understand why anyone who owns an expensive engine would want to save a fiver taking a chance over the quality of the oil. Do you buy Fram El Cheapo oil filters to help extend the engines life ??
One bad thing about cheap oils is that the bae oil is often contaminated with tiny, (10 to 20 micron), particles of Silicon, (Sand), that gets past the oil filter and then gets stuck in the bearing races causing a lot of increased wear. Cheap oils are not filtered. Hydrocrack oils are, (Called full synthetic in the UK and USA, but not the real thing). The best oils for cleanliness are the German full synthetics and Shell GTL, (Gas To Liquids), oils that are used in Shell Ultra.
Not the Honda warranty - I do my own servicing and as long as I use honda parts and make a note of when it's done I'm covered. The oil I use is as previously stated - higher specification than they require...


