20w50 Oil.
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Joined: Jun 2005
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From: Amarillo, TX
20w50 Oil.
I just saw a video saying he uses 20w50 oil in his high mileage engine. He said it will "fill" in gaps in the bearing journals and such. I have a 99 f250 4x4 auto 5.4 257K miles on it and I use 10w40. Should I be using something else? I think I am going to be beating a dead horse here but I had to ask.
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Joined: Jul 2005
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"filling the gaps" is his personal opinion, not based in reality........... 20w50 is kind of thick for these motors.......... If your in the northern half of the country, 20w is thich enough in the winter to starve the motor of oil for a second as the pump trys to pickup the thick oil............. 5w or 10w is the spec.......... Look at youtube on what happens to oil pouring with 20w or 30w oil at ZERO ambient.
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Joined: Jul 2005
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Joined: Aug 2011
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From: Chico,CA.
The local Chevron distributor. He said the "High Mileage" formulas have a higher zinc content.
Just looked into it, motor oils still do indeed have zinc and phosphorus in them. The levels have been reduced with the newer LE series oils but its still there.
Just looked into it, motor oils still do indeed have zinc and phosphorus in them. The levels have been reduced with the newer LE series oils but its still there.
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From: Western NY
Years ago I fell for the thicker is better theory. I had a 79 400 with 4:10's, ran 20w50 in it. Oil press was good, until I watched one day. Running near 3 grand, my oil press was dropping and coming back up. Pulled over checked oil and was ok. Figured out when I was anywhere near 3000 rpm, oil press would drop and fluctuate. Short story was I had a melling hv pump and we figured it was pumping the pan dry because the oil was so thick, it couldn't get back to the pan quick enough. Swapped back to 10w40, no more oil pressure problem.
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https://bobistheoilguy.com/forums/ub...sis_-_PCMO/HDE
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