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[kcl]

Still had it leaking... Original was replaced with a pattern one, only a simple o-ring as a gasket. The original stat housing had a deep groove for the gasket and the original gasket I bought to be used with the pattern stat was useless. The genuine gasket was a quite complex rubber seal and dealer said that the very last ones were with this "new style stat". Now I've bought a new stat from dealers and was sold the "old style" stat, e.g. no twith the deeper groove for gasket. Doesn't seem to leak though.

My question: are we sure that the engine block is the same in the "new" 2,6 and the "old" 2,6. So I should be safe to use the "old style" stat? Of course I binned the original before I was sure I don't need it 

[TheBoy]

There are 2 types of stat, which take different o rings iirc, and due to flange thickness, different bolts.  Neither is better than other.

[kcl]

ok, thanks. So I'm OK using the old style one instead the new styl ewhich was the original?  :-/

The newer style o-ring seemed to be much more rigid design, wonder why... Known problem with sealing the stat at GM  :-/

[TheBoy]

ok, thanks. So I'm OK using the old style one instead the new styl ewhich was the original?  :-/

The newer style o-ring seemed to be much more rigid design, wonder why... Known problem with sealing the stat at GM  :-/

Dont think one is old style and other new style, just 2 different styles.

[kcl]

Ok, two different then but interchangeable, right? 

[TheBoy]

Ok, two different then but interchangeable, right? 

Yes, but you need right seals and bolts for your specific type, if that makes sense

[kcl]

Yes it does make sense. I've got the "other" type now instaled, with the simple O-ring and shortened bolts.

[Gaffers]

Don't forget to wet n dry the mating surface otherwise choice of thermostat won't matter

[Marks DTM Calib]

There are 2 types of stat, which take different o rings iirc, and due to flange thickness, different bolts.  Neither is better than other.

Nah, the one with the larger flange that takes the complex gasket has a much better and more reliable seal with the block face.

[kcl]

This is getting interesting. So I have replaced the better design stat with the not-so-good one? Nice  But then again, I'm getting more and more familiar with the b-bolt, which is now routine and in fact quite easy one. What I don't like is taking the inlet trumpets and flange out again and again... I hope it will not leak anymore.

[Gaffers]

The b-bolt has differing degrees of bstrdness depending on the car, I have done some which were easy peasy, others were a real pig.