Is silicone high temp oil available from cheaper sources?

73 Eugene W2HX
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From: [email protected] <[email protected]> On Behalf Of N8KBC Dave
Sent: Tuesday, October 10, 2023 5:39 PM
To: [email protected]
Subject: [Milsurplus] coolant for Bird load

The coolant in the model 8890 is not mineral oil it is a silicone high temp oil.