It is a 3.9 95 disco I, 150 000 KM, Everything is fine at start up, after a 1/2 hour drive, the Oil pressure light goes on/off at idle. If I drive for longer it seems to be worse and the light stays on.

Usually, If I put it in Neutral or Park, everything goes to normal. No thicking or clicking when the light is on (I know, I need a real oil gage).

This morining, the light was on even on Park so it seems to be getting worse. Now Running 5/30 for winter in Canada, but was doing it sometimes with 10/30 before last oil change.

The engine got warm last summer (Loss of fan while towing) but never overheated, could it be related ?

I'm afraid of big spendings ?

In my old rangie....I run 15w 40(shell rotella), during the winter. Although you just a little north of me, I think we see similar weather.

Your oil pump may need a rebuild as well. A rebuild kit is around $30 US...and is fairly easy to do.

In my old rangie....I run 15w 40(shell rotella), during the winter. Although you just a little north of me, I think we see similar weather.

Your oil pump may need a rebuild as well. A rebuild kit is around $30 US...and is fairly easy to do.

I would drop the pan, have a look at the pickup and screen, see if there is some crud in there or something. At 150K it's pretty low miles for a dead oilpump.

That is my unprofessional opinion.

You might not like my prof. op. :(

You could try 15W40 and see if it goes away. I think you may be living on borrowed time.

I had the same problem with Shopgrrl's Rangie. I'm beginning to wonder if it wasn't the cam being worn so badly it was allowing oil to leak past-ie-misalignment of the lifter with the oil passages.

At 150K, the main bearings didn't look THAT bad.

My only experience with oil pumps is with 4.0s and they seem to wear fast.

You could try 15W40 and see if it goes away. I think you may be living on borrowed time.

Mine is certainly on borrowed time. Course its been on borrowed time for the last two years....the damn engine just won't die.
Been waiting to pull that 3.5 for while....but I can't justify it until it has a major croaking. I swear it is keeping itself alive just to torment me.

non-serp oil pumps are easy and cheap to rebuild.

I will try the 15/40 first, see what appends, I would like to wait untill spring before I rebuilt the pump.

non-serp oil pumps are easy and cheap to rebuild.

You are getting me worried here, it is a serpentine engine, what is the difference ? I always tought 4.x where difficult, but 3.9 easy, is there something different about the serp-3.9 ?

Thanks

non-serp oil pumps are easy and cheap to rebuild.

Great advice...especially if he drove an '87 RR instead of a '95 Disco.

You are getting me worried here, it is a serpentine engine, what is the difference ? I always tought 4.x where difficult, but 3.9 easy, is there something different about the serp-3.9 ?

Thanks

The 3.9 serpentine uses an integral pump, similar, but not exactly identical to the 4.0.
The 4.2s are easily rebuildable, the 4.0/4.6 are not, along with serpentine 3.9s.

"Great advice...especially if he drove an '87 RR instead of a '95 Disco.
__________________"

DOH!

I was thinking 94 D90 in his sig. Did not read close enough. Yes discos in NAS are all serp.

"The 4.2s are easily rebuildable"

In the spirit of correcting, serp continues into 4.2, 95 4.2s are integral.