Sentinel Announces Reserve Information

Sentinel Rock Oil Corporation ("Sentinel" or the "Company") (TSX VENTURE:SEN) is
pleased to announce that it has filed on Sedar it's reserve report for the
period ended December 31, 2008 as evaluated by DeGolyer and MacNaughton Canada
Ltd. ("D&M") and prepared in accordance with National Instrument 51-101
Standards of Disclosure for Oil and Gas Activities.


This report documents the results achieved by the company on its activities
previously reported throughout 2008 from its ongoing drilling programs.


Sentinel's President and CEO Tyler Cran commented, "Although we have financial
challenges like many small juniors in this economic crisis we are pleased that
our reserves and resultant net present values have not seen the drastic downward
revision that others have. We believe that this maintained value will help
Sentinel survive the current economy and exit the downturn as a successful
company in the future."


The Reserves report will be available at www.sedar.com.

RESERVES REPORT

Based on reserves reports prepared by D&M, using forecast prices and costs,
Sentinel's Gross Reserves for December 31, 2008 as compared to July 31, 2008 as
follows (at 10% discount):




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Dollars - Company share                      2008           2009   % Change

Proved                              $     528,000   $    376,000        -29%

Proved + Probable                   $  40,119,000   $ 32,559,000        -19%

Proved + Probable + Possible        $ 112,376,000   $ 96,700,000        -14%
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oil/STB - company share

                                             2008           2009   % Change

Proved                                          0              0          0%

Proved + Probable                       1,605,660      1,416,000        -12%

Proved + Probable + Possible            4,972,005      4,306,000        -13%
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gas/MMCF - company share

                                             2008           2009   % Change

Proved                                        145            150          3%

Proved + Probable                             851            698        -18%

Proved + Probable + Possible                2,012          1,535        -24%
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Combined Gas and Oil to standard BOE

                                             2008           2009   % Change

Proved                                     24,167         25,000          3%

Proved + Probable                       1,747,493      1,557,833        -10%

Proved + Probable + Possible            5,307,338      4,561,833        -14%
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NAV Calculations

shares outstanding 28,493,855                2008           2009   % Change

Proved + Probable (2P)                $      1.42    $      1.14        -20%

Proved + Probable + Possible (3P)     $      3.98    $      3.39        -15%
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NAV Calculations

fully diluted 28,493,855                     2008           2009   % Change

Proved + Probable (2P)                $      1.32    $      1.14        -14%

Proved + Probable + Possible (3P)     $      3.69    $      3.39         -8%
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- The net present value of Sentinel's proved plus Probable reserves decreased
19% to $32,559,000 while the NPV of the total Proved plus Probable plus Possible
reserves decreased 14% to $96,700,000.


(1) Proved Reserves are those reserves that can be estimated with a high degree
of certainty to be recoverable. It is likely that the actual remaining
quantities recovered will exceed the estimated proved reserves.


(2) Probable Reserves are those additional reserves that are less certain to be
recovered than proven reserves. It is equally likely that the actual remaining
quantities recovered will be greater or less than the sum of the proven plus
probable reserves.


(3) Possible Reserves are those additional reserves that are less certain to be
recovered than probable reserves. There is only a 10-percent probability that
the quantities actually recovered will equal or exceed the sum of the proven
plus probable plus possible reserves.


(4) The Net Present Value (NPV) based on D&M Forecast Pricing and costs, before
taxes, discounted at 10%. The estimated NPV does not necessarily represent the
fair market value of our reserves. There is no assurance that forecast prices
and costs assumed in the D&M evaluations will be attained, and variances could
be material.


Additional information on Sentinel Rock Oil Corporation is available on the
Company's website at www.sroc.ca.


All references in this release to BOE's are based on a 6 to 1 conversion ratio.
Boe's may be misleading, particularly if used in isolation. A BOE conversion of
6 Mcf:1 bbl is based on an energy equivalency conversion method primarily
applicable at the burner tip and does not represent a value equivalency at the
wellhead.


Sentinel is a Calgary, Alberta based oil Exploration Company focusing on heavy
oil with operations currently located in Northern Alberta and mid west
Saskatchewan.


This news release contains forward-looking information. Forward-looking
information is generally identifiable by the terminology used, such as "expect",
"believe", "estimate", "should", "anticipate" and "potential" or other similar
wording. Forward-looking information in this news release includes, but is not
limited to, references to: well drilling programs and drilling plans, estimates
of reserves and potentially recoverable resources, and information on future
production and project start-ups. By their very nature, the forward-looking
statements contained in this news release require Sentinel Rock and its
management to make assumptions that may not materialize or that may not be
accurate. The forward-looking information contained in this news release is
subject to known and unknown risks and uncertainties and other factors, which
could cause actual results, expectations, achievements or performance to differ
materially, including without limitation: imprecision of reserve estimates and
estimates of recoverable quantities of oil, changes in project schedules,
operating and reservoir performance, the effects of weather and climate change,
the results of exploration and development drilling and related activities,
demand for oil and gas, commercial negotiations, other technical and economic
factors or revisions and other factors, many of which are beyond the control of
Sentinel Rock. Although Sentinel Rock believes that the expectations reflected
in its forward-looking statements are reasonable, it can give no assurances that
the expectations of any forward-looking statements will prove to be correct.


40,435,855 common shares issued