If the buzzer is consistently coming on after an extended drive you most
likely have an oil pressure problem or a bad, incorrect sensor. If a wiring
problem it would happen regardless of engine temperature. Did the problem
begin after the oil change or was that the reason you decided to change it
now? If this is after the oil change carefully check the oil level. Over
filling the crankcase can cause this. The excess oil level causes the oil to
get churned, gets hot and aerated, and will cause decreased oil pressure. At
low speeds the problem is masked after resetting the engine as the higher
pressure switch is only looked at over 2,000 rpm.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Van Pelt, Steve
Sent: Tuesday, March 3, 2015 12:20 PM
To: vanagon@GERRY.VANAGON.COM
Subject: 1987 2.1 WBX oil buzzer comes on after hiway usage...

Hi all,

My oil buzzer comes on after a 30 minutes or so of hiway usage.

I've changed the oil, using 20-50 Castrol GTX, and am wondering if the
motor's got issues, or the oil buzzer system does.

If I turn engine off, and then on again, it'll stay off for a little
while... other times, it'll just buzz for a second or two, then turn itself
off. It gets better at slower speeds.

Any thoughts?

Regards,
Steve