Oils intended for use in gasoline automobiles will mix, viscosities, conventional or synthetic - read lablel that they meet the SAE standards and they should work.
Higher viscosity would usually tend to leak slower depending on what's leaking. Oil leak and high consumption is not really normal especially in most newer cars and yours is known to do well in this regard.
It's not just the cost of buying oil but more important that it not run low enough for an oil pressure warning as damage will begin at once if the case.
Site sponsor is Amsoil which is synthetic and a fine oil. I also like Mobil 1 and other synthetics are probably worth the extra money as well.
This is not to say the conventional oils are bad at all. I simply know from decades of use now that synthetics fair better against heat and the tendandacy to sludge - a killer.
Claims of increased fuel economy due to less friction is a very real and Mobil at least has had the "canolis" to put a cent's per gallon equivalent savings on thier new 0-30 and flat out states "meets or exceeds all requirements of 5-30 or 10-30" !!
Just this year I used it in a 12.5 HP pull start engine and clearly noted right away that it's easier to pull start especially when cold is pretty good evidence for me.
With extreme service higher vis oils have done well such as service vehicles. At this point it's your call,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/
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