Can one bring a 160cc Vietnam registered bike back into Vietnam?

May 9, 2006
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In 2023 I bought a used Honda XR150 in Saigon, rode north, entered Laos, then Cambodia, and back into Vietnam, all without issue. I believe that 175cc is the max engine size limit in Vietnam before the "Big Bike" sales tax is imposed when purchasing new. However I had always read that coming back into Vietnam on a Vietnamese bike, that 150cc was the largest size bike allowed in (unless on a tour with permit). Convoluted but very Vietnamese, if true. I now see a lot of scooters and bikes available in the 160cc range, and am wondering if anyone has re-entered Vietnam on one?