At this point ..
I would go over the rocker arm screw adjustments..
starting with a careful inspection of rocker arms and pushrods.

on the lifters that are pumped up ....I'd adjust the .

on the other ones ....at least I know they should work and I estimate
the screw position to mid-travel of the lifter .

start thinking about getting the left lower pushrood cover off ..
so you can access the oil pressure switch ..
and then start thinking about how to connect an oil pressure gauge there.

if you know it's got a bazillion miles on it ..
like original 26 yr old/whatever engine ...you could be on last legs of
course.

just put in 60 Wt. Racing oil ...( partly joking )(
and
either fit a guage or pay careful attention to which exact pressure oil
pressure switch you want in there, and put in a good non-cheap new  one.

On 8/16/2015 6:22 PM, Tyler Hardison wrote:
> Hmm.. Still have the oil light, although less frequently. Valves chattered
> once after a run at 65 mph for a few hours. Backed off to an average of
> 50-55 and it went away.
>
> Still averaged 18.9 mpg over the last run of 380 miles.
>
> On Sunday, August 16, 2015, Stuart MacMillan <stuartmacm@gmail.com> wrote:
>
>> It will evaporate in a thousand miles or so, so check  the oil level.  If
>> your valves are clattering all the time, you may need that engine sooner
>> rather than later.
>>
>>
>>
>> Stuart
>>
>>
>>
>> *From:* Tyler Hardison [mailto:tyler@seraph-net.net
>> <javascript:_e(%7B%7D,'cvml','tyler@seraph-net.net');>]
>> *Sent:* Saturday, August 15, 2015 9:35 PM
>> *To:* Stuart MacMillan
>> *Cc:* vanagon@gerry.vanagon.com
>> <javascript:_e(%7B%7D,'cvml','vanagon@gerry.vanagon.com');>
>> *Subject:* Re: From flickering oil light to valves clacking
>>
>>
>>
>> 4oz measured. Just enough for the extra solvent properties.
>>
>> On Saturday, August 15, 2015, Stuart MacMillan <stuartmacm@gmail.com
>> <javascript:_e(%7B%7D,'cvml','stuartmacm@gmail.com');>> wrote:
>>
>> Tyler,
>>
>> MMO is a thin, light solvent--you just diluted the physical thickness
>> (viscosity) of your thicker oil!  How much did you add?
>>
>> Stuart
>>
>>
>>