Pass text to OpenQuery function

Trying to query a linked server using a parameter. Can't seem to pass a string to the OpenQuery function
For example:

Select @TSQL = 'select product_id_i, prod_stl_days_i from product where product_id_i=259287'

Select * From OpenQuery([MUNIPRIME],  'select product_id_i, prod_stl_days_i from product where product_id_i=259287' ) A
Select * From OpenQuery([MUNIPRIME], @TSQL ) A

The first select will work. The second select using the same string will give the error
Msg 170, Level 15, State 1, Line 10
Line 10: Incorrect syntax near '@TSQL'.

Can someone tell me what's going on?
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Reza RadConsultant, TrainerCommented:
try this:

SET @sql_str = N'select * from OPENQUERY([MUNIPRIME], ''' + REPLACE(@TSQL, '''', '''''') + ''')'

PRINT @sql_str

EXEC (@sql_str)

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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The Book Onlines states clearly that you cannot use any variables for OpenQuery arguments. You need to use dynamic SQL, as shown above.
stopher2475Author Commented:
Thanks for the help. Found some other people with the same issue. They were pointed to here:
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