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10w30 is what I've used for a long time in the summer, and it works much better than the 5w30. See how you make out with 10w30, that certainly will not hurt anything in the summer months (I would be tempted to switch back to 5w30 in winter depending on where you live, your engine will let you know on start if it's getting too cold!). Keep in mind with any heavier grade oil it will take longer to circulate around the engine on startup so if you use a super heavy grade or it gets too cold for 10w30 you'll be wearing out piston rings and the like and potentially making the oil problem worse (I seem to recall hearing that 90% of engine wear occurs on startup, particularly in winter when the oil takes a while to make its way around).
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