John, I have used Castrol from the day I bought my first Pentagon noon until the day I switched to Rotella for diesel. During the time I was driving gas panic guns, I never saw the light come on after a hard drive until the time I had to go to New York. I was in such a hurry to get out of Town that I let an oil change place put in some other brand of oils a crap filter.  All the way up every time I would slow down to an idle the oil light would come on. As soon as I got back, I switched back to Castrol, and the problem went away.

Jim

> On Feb 28, 2015, at 4:25 PM, John Rodgers <jrodgers113@gmail.com> wrote:
> 
> I have cases and cases of this oil passed down to me by 'Unca Joel. This engine has never known anything else. Oil has zinc in it. I really don't see where changing oil brands would have any effect, except where synthetics are concerned, like moving from dino oil to a synthetic like Mobil One 15W50.
> 
> John
> 
>> On Feb 28, 2015 1:46 PM, "Jim Felder" <jim.felder@gmail.com> wrote:
>> Switch to Castrol
>> 
>>> On Saturday, February 28, 2015, John Rodgers <jrodgers113@gmail.com> wrote:
>>> Oil is Kendall GT-1 20W50.
>>> 
>>> At idle, flickering light, turn the engine off, then restart, the light no
>>> longer flickers. It might, or it might not, flicker at the next stop.
>>> 
>>> I have never had a low oil pressure indication before. But the engine was
>>> out of service while the oil cooler seal was replaced and two pushrod tubes
>>> were replaced on the side opposite the oil pressure switch. That switch was
>>> undisturbed. When the van was again put on the road, the first time out,
>>> the light flickered at a stop. Am mystified why it has never flickered
>>> before, now suddenly it does. Engine has 114, 000 odd miles on it.
>>> 
>>> John
>>> On Feb 28, 2015 12:58 PM, "Dan N" <dn92610@gmail.com> wrote:
>>> 
>>> > either the oil pressure sensor are bad or you have a low oil pressure ..
>>> >
>>> > what grade of oil are you using?
>>> >
>>> > On Sat, Feb 28, 2015 at 10:45 AM, John Rodgers <jrodgers113@gmail.com>
>>> > wrote:
>>> >
>>> >> The oil pressure light comes on after a long run at speed when I have to
>>> >> drop to idle and stop for traffic or a stop light. Doesn't happen every
>>> >> time but frequently enough to keep me spooked. I have checked the wires
>>> >> and
>>> >> found no faults. What is happening. What else might cause this?
>>> >>
>>> >> John
>>> >>
>>> >
>>> >