Quote:
Originally Posted by TravisWBrooks
I have an '89 F-250, 5.8L, with the original oil pressure gauge, and an aftermarket PSI gauge installed, and even after adding nine quarts of oil, it still drops to zero PSI whenever I slow to a stop, or I'm moving really slow. Do you think it could be the oil pump causing the problem? Cause when I check the oil manually, it shows plenty of oil on the dipstick. Don't know what else it could be.
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Most likely your bearings are getting worn. You might try running 15w40 oil and in the summer even adding a quart of Lucas oil stabilizer.
Do you know how many miles are on the truck? If you don't let the engine run for any length of time while on zero oil pressure it may well run you a very long time that way. Don't put too much oil in the engine, not much over the full mark on the dipstick.
PS I have a 1990 F-150 with a 302 that basically has the same oil pressure problem as your truck. I am doing as I advised you and it is serving me well.