Re: Does the oil cooler ever drain? - Bulletin Board

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Re: Does the oil cooler ever drain?
Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Thu, 8 Feb 2018 11:47:02

In Reply to: Re: Does the oil cooler ever drain?, Simon S, Wed, 7 Feb 2018 09:21:25
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After reviewing some old posts I can see why the oil cooler never drains. Short version, the oil cooler can't drain because the 225°F oil thermostat is closed.

Long version: Oil flows from sump to pump to oil filter to the thermostat. After the engine warms up the summer temperature of the sump of a '94 - '98 engine is reported to be in the neighborhood of 200°F - 210°F. It probably takes a combination of hot weather and heavy traffic – or perhaps some very spirited driving – for the oil temperature to reach 225°F resulting in an open thermostat and flow through the oil cooler circuit.

To be technically correct the oil temperature sender probably is sending the temperature of the oil pan, not the oil itself which is a little hotter.

It comes down to the question of how much oil remains in the engine (The 0.4 liters parked in the oil cooler circuit is irrelevant.) after it has been drained and the filter removed. The '94 and '97 manuals appear to be of the opinion that 0.4 liters remain; the '95, '96 and '98 manuals assume 0.8 liters remain.

First generation ('90 to '93) B234 engines took 4.5 quarts which filled them to the full index mark on the dipstick. Per the Saab Service Manual the dry capacity of that engine + filter was 4.6 quarts, which means only 0.1 quart remained in the engine. A lot must have changed in the 2nd generation B234 engines.

->Posting last edited on Fri, 9 Feb 2018 13:50:00.
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