Tell-tale signs of • mechanics

Glider tugs cruise for about 10 seconds before diving and driving for the field, so I have no idea. Mostly try to keep it from cooling - but 180-190 on the way down is typical.
Yeah I'm gonna go with high oil temperature as the cause of your anomaly. Like I said you could try a thicker weight of oil or a multi grade and see if it makes a difference.
As always, without putting hands and tools on the airplane there's a pretty good chance that I'm totally wrong.
 
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