Quote:
Originally Posted by startrek.steve
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Roughly the order from cheapest to best goes:
Mineral (Mineral Based)
Semi Synthetic (Mineral based)
Fully Synthetic (Not mineral based)
I say roughly because a good quality oil of one type can exceed the standards met by a cheaper oil of the next type up.
The oil you are using is probably a car oil. I would really prefer this thread didn't turn into a heated debate about whether you can use car oil in bikes. The bottom line is that you can, but it can cause probelms with a wet clutch as Tim pointed out above, and motorcycle specific oil is designed to withstand use as a gearbox oil as well, where as cars use a seperate oil type for this.
There was an article in "Bike!" last year about a courier who got about 400,000 miles out of most of his bikes and used a cheap car oil, but then he would have had very few cold starts. It's all rather hard to quantify, so I just buy a cheapish semi synthetic motorcycle specific oil that's 10w40 and meets API SG or higher for my bike.
There you go, clear as mud innit?
Jambo