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Was there a big temperature difference outside during the time when you used the two oils? This is just very odd to me. I've not heard anything like this before. I mean, I'm not debating that it can't happen, because it obviously did to you.
No same temps roughly, I posted a thread about it awhile back and got mixed reaction's most being " NU UHH " " thats impossible " sort of thing. Thats why I felt the whole synthetic thing is just over rated. Iv'e had vehicles in the past that didn't like synthetic for whatever reason but judging from all the hopped up reviews I got about putting it in my psd I thought it would be a good investment, but just didn't get those same results so.... I dunno.
RushN350 I never had the romps with whatever oil I used. The only difference that I noticed with my truck is quieter operation when cold and during warmup. Once it's fully warmed up, no difference in performance or sound level.