Start up oil pressure, takes too long for the low pressure light to go out?

[Flyfish]

Check where the pickup tube connects to make sure your not sucking air. Don’t remember if there’s an o-ring where it attaches.

 

[Disco95]

Checking back in on this thread after nearly a year. To recap, I went through everything* as part of a front cover reseal and didn't really find a smoking gun. It's consistently fine on cold starts in warm weather with 15w40 (oil light off w/in 5 secs) and consistently terrifying in "cold" weather (here in the PacNW, that's 35-45F, oil light on >10 secs, up to 30 sometimes). Warm oil pressure is w/in spec any time I've measured.

The oil flow up front is convoluted. Can anyone confirm whether the pressure sensor gets oil if the filter's being bypassed? The relief spring (there's only one in my 95--I assume handles pressure and bypass duties) measured in spec, but the only thing that makes sense to me is a hyperactive bypass valve because the engine sounds fine while the oil light's on. In fact, it's pretty consistent that the lifters are quiet *until* the oil light goes out, then they clatter a little.

I'm going to fill it with 5w40 next oil change just to test my theory. I'm betting it "solves" the problem. Kind of wishing I'd replaced that relief spring now, even though it was in spec...

* pressure sender + checked with gauge, pickup tube + o-ring, pump, relief spring, oil filter brands, etc.

Cheers,
joe b
pdx or
95 Disco v8 5-speed 199k

 

[terryjm1]

Mine behaves exactly the same. I got sidetracked with another D1 after I dropped the oil pan in the slow oil pressure in cold weather D1 and found no sludge. I will get back to it sooner or later.

 

[robbyb20]

Checking back in on this thread after nearly a year. To recap, I went through everything* as part of a front cover reseal and didn't really find a smoking gun. It's consistently fine on cold starts in warm weather with 15w40 (oil light off w/in 5 secs) and consistently terrifying in "cold" weather (here in the PacNW, that's 35-45F, oil light on >10 secs, up to 30 sometimes). Warm oil pressure is w/in spec any time I've measured.

The oil flow up front is convoluted. Can anyone confirm whether the pressure sensor gets oil if the filter's being bypassed? The relief spring (there's only one in my 95--I assume handles pressure and bypass duties) measured in spec, but the only thing that makes sense to me is a hyperactive bypass valve because the engine sounds fine while the oil light's on. In fact, it's pretty consistent that the lifters are quiet *until* the oil light goes out, then they clatter a little.

I'm going to fill it with 5w40 next oil change just to test my theory. I'm betting it "solves" the problem. Kind of wishing I'd replaced that relief spring now, even though it was in spec...

* pressure sender + checked with gauge, pickup tube + o-ring, pump, relief spring, oil filter brands, etc.

Cheers,
joe b
pdx or
95 Disco v8 5-speed 199k

I switched over to 10w30 T4 Lucas oil Stabilizer and havent looked back. When i used 15w40, Oil light consistently took 10-15 seconds, replaced oil pump, changed oil religiously, got oil tested for wear, etc. Both oils are silent on startup and cause there to be a slight tick when warmed up. Ive learned to just ignore i as the light never comes back on. My reason for 10w30 is solely for start up purposes. Also in PNW.

 

[terryjm1]

I am currently running 10w30 but recently purchased some 20/50 Castrol high zinc. I know the viscosity isn’t going to do my problem and favors but I am going to replace one quart with Lucas oil stabilizer. It should be at a minimum a good test. This one won’t see much cold weather driving. I also have some 5w40 Valvoline I have been considering instead. Which one I use will be a decision made when I get around to changing the oil.