Sounds like there is something wrong with the 710 level or possibly the wrong kind of 710 fluid.
My 1999 silverado pick up has had that sound since it was "new" at start up. 320,000 miles later its still there.
Any chance you changed brands of "oil" recently or had someone other than yourself change it for you.
For the cheap monies it cost to just "do it" I'd change the oil with exactly what the manufacturer recommends for this time of year.
Sounds like a "lazy lifter" if it goes away when you give the engine a little more speed/rpm and generate a little more oil pressure to pump up the lifter.
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