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I have a 1995 F150 4.9L auto w/4.1 gears and about 120K.
Pretty basic truck, and very reliable. Have also used it as short commuting truck, anywhere from 50 to about 90 miles a day on a four day week. This is off and on, wife and I trade vehicles sometimes.
Looking at new job and new city. Also a commuting distance of maybe 10 to 20 miles a day.
I currently use motorcraft 10-30 and motorcraft filter. I use motorcraft 5-30 in winter months.
Watch and see if the engine comes fully up to temperature by the time you get there. If it does you're ok. Usually it takes about 3-4 miles for my vechicles to fully warm up. At 10-20 you're fine.
For short commutes, if you are using regular oil change intervals, you might want to go to the "severe duty" interval spec'd in your owner's manual. For a 10 mile one way commute on the highway, you'll be fine with the regular interval.
Originally posted by rusty70f100 Watch and see if the engine comes fully up to temperature by the time you get there. If it does you're ok. Usually it takes about 3-4 miles for my vechicles to fully warm up. At 10-20 you're fine.
I always thought my truck was warmed up fully when the temp gauge got up in the middle, but when I installed a real oil pressure gauge, I saw that the oil must not fully warm up for at least 10 miles. The pressure is higher cold and then will slowly drop to the hot pressure over 10 or so miles.
10 miles is about the right limit for what would be called a "short trip", especially in the cold. Your profile shows TX, so severe cold is not an issue. No need to do anything different than you are doing now.
Paul makes an excellent point. Without an oil temperature gauge, you can tell something about oil temperature if you have a real oil pressure gauge. I have noticed that myself. After a long high speed run, the idle oil pressure is a little low for a few minutes until the oil cools down.
Yeah, I suppose I was looking at the coolant temperature. Now that I think about it, the oil does take longer to reach it's lowest running pressure, showing that it's fully warmed up. Good point.
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