mattbred said:Is this bad for a warmed up, cruising (1550 RPM) 1989 4.0L cherokee?
The needle was where the red one is now. Also I don't understand the numbers? (I'm in Canada btw)
For the record, I'm using Shell 10w30 dinosaur oil, with an AutoExtra oil filter.
Ecomike said:The Canadian one is marked in Bars I think. One bar is one atmosphere, one atmosphere is 14.7 PSI.
Not sure about the two needles issue? 13 PSI is factory minimum at hot idle of 750 RPM. You should have more like 30 psi or higher at 1500 rpm so that looks low. IF its got a lot of miles I would move up to a lot thicker oil in the summer like 20W50. Then 10W40 or 0w40 in the winter.
Also a plugged, plugging oil filter, or bad oil pressure sensor can give you a low reading.
Also be sure and read the latest oil thread here on the zinc additive issue (problem) with all the current oils.
mattbred said:What are some good additives to bandaid my situation until I do the oil again?
mikeforte said:Read the thread on here now about oil. It was posted by Ecomike and is now up to 4 pages. It will give you some choices and some oils to avoid. All in all a good read.
mattbred said:Some good information here. Man I love Naxja.
Ecomike, I took the picture and edited it to add a fake needle where the white one WAS while cruising at 1550 RPM. If the middle is 3 bar, and far left is 0 bar, then I should be running at around 15-20 PSI. Which is what the gauge says. When it is cold, the needle is at or above the 3 mark, which is good. I'm thinking it could be a sending unit, and I want to replace one. They're a bit pricy at napa though (30-40 bux).
Thanks for all the tips. I think I will get the pressure checked and confirmed and go from there!
mattbred said:When cold, idle is around the half way mark I believe (3).
I'll try changing the oil filter. Is it possible to change it without draining the oil first?