As I understand it, the early V70s weren't fully OBD compliant. That's certainly the case with my 1998 Tdi which needs VOL-FCR to set the pump timing. However I believe later 1998 V70s may well be compliant but I'm not sure.
With regard to the glow plugs I can confirm from experience that they have precious little effect on starting unless it is seriously cold; well into minus figures.
My car has never had any bother starting in this country but it wasn't until I had to remove the cylinder head to sort out a bent valve after a cambelt failure that I discovered all 5 glow plugs were open circuit and had probably been like it for years. The only time it had failed to start first turn was when it got down to -11 Celcius on one occasion.
Martin
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