>Interesting thread. My recently purchased '86 Vanagon GL oil pressure sensor
>buzzer and light alarms intermittantly only once the engine temperature
>rises above the midpoint of the temperature gauge (ie when driving in stop
>and go traffic here in the SF Bay area!). If I drive in third gear and drop
>my speed such that the engine's rpm's drop below 3,000 and then attempt to
>accelerate back up, the alarm is actuated. If I downshift and run the rpm's
>back up, the alarm goes off.
>

Sounds possibly like worn bearings or oilpump, producing low oilpressure.
Giving it a rev increases the pressure sufficiently to stop the buzzer. The
oil light in my 69 Kombi comes on at idle when hot, indicating a similar
condition in the van's LETHARGIC Corvair engine.

Andrew