my suzuki grand vitara 2002 4wd oil light comes on at low rpm but goes out when the engine revs or is driving at a constant speed. i have changed the oil switch , oil pump, filter , oil . help.
Then you have excessive clearances inside the engine causing the pressure to drop, the right way to fix it would be to overhaul the engine, but you might get a few more miles out of it by going to heaver engine oil like a 20W50, but eventually you will have to an overhaul or scrap it. These weren't designed to go much over 100K.
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