Originally Posted by 03R44Edge
Got just over 100 k on my 03 4.0 Ranger.
Always used Quaker State 5w30 and Motorcraft filters....
Changed oil/filter last night and used Castrol GTX 5w30..
Seems to be noisy in the top end on start-up.....
My buddy,who works in a shop suggested that I should be using 15w40 due to the mileage getting up there...
Should I dump the GTX and go back to Quaker State?
What oil is called out for your engine by Ford ?
That is what I would change back to.
Also, if you go to a Syn-Oil, use the same oil weight rating, donít go to a lower weight just because the oil package says it will work.
No disrespect to your friend but any mechanic should know that most Ford engine do not like any oil weight about what is suggested by the factory.
100K isnít much for the newer engine but donít go to a higher weight oil viscosity oil unless there is a reason for it.
I have always used 5-20 in my 2003, 3.0 and my 5.0 I used 5-20 or 10-20.
One of the few oil changes I had a shop do they used there shop oil, I was assured it was 5-20 and I let them do it, WRONG !!! Not sure what they used but it was from their 55 gal barrels, I assumed (there is that @ss thing out of you and me) what they told me was correct but after the oil change the engine was noisey, the upper end was ticking, WTFÖ I didnít know for sure what had happened. The shop wanted to tear down the upper end to see how much of a problem there was.
I stopped them at that point, asked to see their oil barrel and low and behold on the outside of the barrel it said 10-40, I asked where the 5-20 was and they said this is the oil we use on all oil changes, I told them not on mine anymore.
I changed the oil and filter, 5-20 oil and Motorcraft Filter and wham ban, all the ticking went away.
So in conclusion only use what is suggested by Ford, as the engine ages and miles start to rack up, test out the heavier weights but stick as close to OEM as possible.
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