Originally Posted By: KCJeep
Out of vogue here no doubt but 10w30 is still useful and will usually work very well in about anything you care to use it in. Heavy towing, summer, exactly a situation where 10w30 would be useful or even a better choice.
Years ago I was looking to get a new car and found myself in an Acura dealer. I asked if I could look under the engine bay of an NSX and then popped it and tried to figure out how to get it up. One up, there was the typical info for recommended oils, spark plugs, etc on the air filter housing. I was a bit surprised that the recommended oil was a 10W-30 when 5W-30 was pretty standard by that time.
However, what's really out of vogue these days is 30 wt oil except maybe for lawn mowers. I remember hearing someone comment that for ideal protection (but not necessarily fuel economy), 30 wt could probably work better if there weren't concerns about cold starts. If it's summer temps, it should flow pretty quickly, and if you could ensure that it only gets warm starts or that a block heater is used long enough before starting, it would be ideal.