Excessive vibration whilst stationary

[scanner]

It should be 5w/30 or 10w/30.

Thanks ... fair point .. though the FAQ section does mention that 'In standard UK operating temperatures you should use 10W-30 oil. In colder climes you should use 5W-30. If you find these difficult to obtain, then 10W/40 or even 15W/40 will do.'

Could it contribute to such effects as more vibration at idle and higher (more rattly) engine noise ?

Some have said that the extra viscosity of 15w/40 over 10w/30 can make starting more difficult and increase fuel consumption by several mpg (i.e. less MPG due to the extra drag from the oil circulating in the engine).

[duncsuk]

Thanks .. I'll keep an eye on MPG. I've been getting a steady 24 mpg up until now.

[mikeonb4c]

I do a lot of short runs so have always used a 5W bottom end spec for the reasons scanner mentioned specifically so it flows better sooner and improves possibility of improved MPG. Hadn't considered starting but it's an interesting thought and must also be true I think.

[scanner]

It's what 5W means and why it's specced for cold climates.

Less internal drag in the engine, so the starter motor has less work to do and so less strain on the battery.