The transmission type (manual vs automatic) does not, in itself, make any difference in regards to IMS concerns.
There are some anecdotal statements that a manual might be better for IMS longevity because the driver typically can maintain higher rev's which might provide better IMS lubrication in some situations, but I've never seen any actual data to back this up.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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