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mixing oil grades
Posted: 11 Jan 2009, 17:54
by jpee
Is there a problem with mixing oil grades, ie a 10/40, 15/40 and a 20/50 ?
Re: mixing oil grades
Posted: 11 Jan 2009, 18:00
by Syncro G
If they are all mineral (non sinthetic) and your topping it up it'll be fine. If its for an oil change better to just put the right grade in rather than mix, not know exactly what you've got and worry - proper oil/maintinance is much cheeper than engine repair, though if its near the end of its life I'd be less bothered.
Re: mixing oil grades
Posted: 11 Jan 2009, 22:01
by mrted
jpee wrote:Is there a problem with mixing oil grades, ie a 10/40, 15/40 and a 20/50 ?
It will change the viscosity (how easy the oil flows) of the oil in the sump,
and the mixture will assume the properties of the cheapest oil you used.
Best as a tempory solution
John