I've followed your posts...

The mechanic you ran into is obviously very "old school"...meaning that he
doesn't think any car is a real Porsche except for the 911 series.  I would
question that as I have owned 914's, 914-6's, 924, 924 T, 944, 944T, and
911's from 72, 73, 74, 76, 78, 88, 01.  Each car has its own pluses and
minuses.

He is correct in one aspect:  All the older cars are going to need a lot of
TLC (or tender loving care) as we say in the "States".  They're going to be
expensive to keep up...and parts and mechanics with any knowledge of the
older 911's are both expensive and sometimes hard to find.

The 928 was an impressive car...probably ahead of its time; however, as they
have aged there can be some really hard to solve technical problems, mostly
in the sensors, wiring and electronics, and not too many technicans know how
to solve these.  Before buying a used one, you should be willing to pay for
an intensive prepurchase technical inspection by a mechanic who has the
proper equipment and knows 928's very well.

Oh...when I was at the factory about 20 years ago, we watched them building
928's and I can tell you from that experience why it's so hard to do some of
the service work...especially if you have to remove the engine, etc.  In
assembly, the complete body with wiring and electronics was lowered down
onto the rolling chassis with the drivetrain already installed.

Regards from Texas....