I have had the fake gauge and DIC say low oil pressure on and off since 2020. My XUV w/ 4.2l has 225K miles on it. It sounds and runs fine. But, normally in summer when it is warmer after about 20-30 mniutes of driving, if you stop at a stop light it shows low oil pressure. The XUV is more of an emergency car and doesn't get driven much anymore. I put an AC Delco oil pressure switch in it back in 2020 when it first did it. It didn't change anything though. I have also ran MMO in the oil a few times. Didn't really want to tear into it and being that is isn't driven but a few 1000 miles a year I just left it. Most trips are less than 30 minutes anyway. And, it doesn't have the issue in the winter. But, I just ran across some posts on youtube about draining the oil and pouring 3qts of Gunk parts cleaner down the dip stick hole and letting it sit over night. Then drain that out the next day and flush it out with cheap oil, ATF, diesel, or kerosene. Feed back seemed good. No one said it didn't work for them. My question is what is the best way to flush out the parts cleaner? I figure just pour 5qts of cheap oil down the dip stick hole and then just immediantly drain it back out. Thoughts? Then, go back to Pennzoil Platinum High Mileage Full Synthetic and new filter. Might replace one qrt with MMO just for good measure.
I don't have an oil pressurer tester or I would test it. The parts cleaner is about the same price and maybe it will fix it for good. Should at least clean something out of it after 225K miles. If I were to get a tester, how long of a hose would I need to reach all the way to the window shield so I could see it when I drive it around. Any recommened testers that will reasch and don't go up to 140+ psi? I figure a smaller psi range would be more accurate for the psi I would be measuring.
I don't have an oil pressurer tester or I would test it. The parts cleaner is about the same price and maybe it will fix it for good. Should at least clean something out of it after 225K miles. If I were to get a tester, how long of a hose would I need to reach all the way to the window shield so I could see it when I drive it around. Any recommened testers that will reasch and don't go up to 140+ psi? I figure a smaller psi range would be more accurate for the psi I would be measuring.