Is 10 40 oil good for a high mileage 99 F150? and how many quarts of oil does a 99 F150 V8 4.6L take?

 

I'd just stick with the 5w30 oil regardless of mileage - but thats just me. Basically if tolerances or wear becomes enough of an issue with leaks, lack of compression whatever - its better to fix what needs to be fixed than mess with additives or different types or weights of oil. I don't think the 10w40 would give you any gains in longevity, mileage or anything else either at this point. Anyone else have opinions on this?

 

I already have 10 40 at my house, is this oil ok for a 99 f150? and how many quarts of oil does it take?

 

I personally wouldnt put any other grades than 5w20 or 5w30 in my truck. But i work for my countys fleet programs, and all our vehicles( somewhere around 200-300 f-150s, about 300 f-250 to f-350s, those are an est. of our vehicles.) use the same 15w40 oil, and we have never had any problems with this weight oil. If you have it, you can use it.

 

Oh yeah it should take about 7 quarts.

 

6 quarts should do it.. 10w40 is a little thick, but if the temperature where you live is above freezing, should not have troubles. if you have high milage and motor is using some oil, the thicker stuff might help a little. 40 wt is a little thick, but if you got a good supply, go for it.

 

I live in Houston, TX it never freezes over here. I have another question, I am going to change my diff fluid. I bought 2 bottles of 80 90. How do i know when to stop pouring it at? or how much do I put in?

 

10w40 is really too thick. The engine wear mostly happens at start-up and it is thicker cold and will take longer to reach the heads and increase wear. There are no cam bearings in the heads, just a thin layer of oil between the cam and head. 5W-xx will get the oil up there much faster.
You fill the differential until it starts to run back out of the plug.

 

Oil is chep motors are not iwould stay 5W30

 

Id stick with 5w-30. 40 weight is really much thicker than your engine needs and in the long run is going to do more harm than good.
BTW, your engine holds 6 quarts, not 7.

 

k. thanks for the replys. i am going to go buy 5 30 tommorow. Is 5 30 good for high mileage too?

 

It will work fine. It takes 6 qt's. Only use a Motorcraft filter too, they have the best anti-drainback valve to keep oil in the filter. It is common on alot of these trucks to show 1/2 qt. low after an oil change. For some reason, the dipsticks don't seem to go in far enough or something. Just leave it at 1/2 qt. low if that is what it shows and as long as it shows this later when you check it, you will know it is full.

 

Buy 7 quarts and keep one behind/under the seat. I have to add about a quart between oil changes. Don't know where it goes...just dissappears.

10-40 should be just fine. The previous owner of my truck used 10W40 since the day it rolled off the showroom floor, and I bought it at 80K and she runs like a champ with no noise at all. I have switched back to 5W30 just because our other vehicles use it too.

 

I second the motorcraft filter, or Wix. I've used several other filters and get some rod knock on startup because there isn't sufficient oil there - doesn't happen when I use wix or motorcraft. Personally though I prefer the wix and feel its got a better design - but everyone has their own opinion. Specifically though I'd stay away from the fram filters. They have cardboard ends to the filter elements and can disintegrate - it can and has happened and the outcome isn't good.

 

I wouldn't think 10w40 would be a problem. Heck my mechanic even uses 20w50 but I live in Phoenix, he maintains alot of lincoln tc's with well over 300K, no motor problems whatsoever.

On the other hand, if the manual says 5w30, may as well use it but if is you have 10XX whatever may as well make good use of it. Just my two cents.

Mike