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Symptoms point to the valve seals, but typically they do not degrade at such low mileage. Typically, valve guides and seals last much longer than 90K provided the engine has received appropriate oil changes and has not been overheated.
The 3.0 liter Mitsubishi used in Chrysler/Doge/Plymouth minivans in the 80's and 90's were notorious for early valve seal failure, but they usually lasted 100 - 120K before belching embarrasing puffs of smoke.
Not familar with your engine, perhaps others can comment on whether or not this is a problem area with that particular powerplant.
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Mike
82 240D 97K Original (Sweet)
96 Ford F350 CrewCab Dually,7.3 PowerStroke,144K
(a real workhorse, does anything I need)
04 VW Jetta GLS TDI, 33K (50 mpg & it's quick)
Notice a trend? All diesels
63 Chevy II Nova Convertible (wife's) awaiting restoration - Well everyboby has a little gas every once in awhile
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