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It is. You might want to try 10/40. You say it idles at 90 but can exceed 100 if you slam it. How high does it go? Do you know? I had a similar "problem" when I installed a HP kit in my Precision Oil Pumps (Melling) pump. It went to 160 psi. You risk bursting oil filters and oil lines at that pressure.
I'm living with my "problem" bu running 5/30 synthetic. When it is hot I get 60 psi at idle and 80-90 at cruising speed. You may or may not want to replace the oil pump.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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