What do you mean by "Not sure when to flush the transmission, but without a dipstick" If you did get the 2.5L as that is the same as I have, there is a dipstick. It is just down pretty low underneath to the left of the air box. It is a yellow top and not the easiest to get at or out. I would check out the condition of the fluid and in my book, if no issues currently, change it out.
TomK
2006 xc70 Blue/tan 160,000 miles
2002 BMW 530i Sterling/Black 97,000 miles
2001 Mazda Millenia Sand Mica/Tan 190,000 miles
2003 VW Passat 1.8T 146,000 miles
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