So the engine is from Ford? Call the Ford parts dept and ask them about using 15w40. I thought they went with a Jasper since you were talking about a high volume oil and all the redesigned parts and since they wanted to change the oil in 500 miles.
Educate me on 'High Zinc Content' motor oil
- Thread starter dragoneggs
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The Ford GT does take 5w50 but not high Zinc.
ModMech
Platinum Member
Ford ABSOLUTELY DID NOT "redesign" the engine and has NEVER EVER recommended 15w-40 oil in them.
Higher numbered oil is the OPPOSITE of what you need for "tighter machine tolerances" - yet another clue the rebuilder is clueless.
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I have a lot of older engines and was told zinc reduction was done to prevent catalyst damage and running a high zinc oil leads to premature emission failure.
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dragoneggs
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Definitely not Jasper, the shop said they avoid them like the plague. It's not direct from Ford. Saved $500 by going this route but it is all Ford parts.
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dragoneggs
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From what I understand, Ford did make modifications to the cam phasers, timing chain and oil pump in later years. I hear you on the tighter tolerances comment. I was scratching my head on that but I think it was more about the settings on the variable timing being tighter, not machining tolerances. Not sure though.
R Barger
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I had a 5.4 3 valve rebuild about 10k mile back by a rebuilder who made changes in the came phasers. He required 10w30 during the 12 month warranty period. Still running 10w30. I also put 200k on a 2007 5.4 3v and used 10w30 for the entire time.
Copperhead
Veteran Member
No sixdogs, a 5w30 is not a 5 weight. It has a Cold Crank Simulator (CCS) that matches -30C. The number in front of the "w" is not a weight, it is a cold weather rating. Now, to some degree, a 5w30 is not a full 30 weight. it is generally a lower viscosity with polymer viscosity improvers that make it like a 30w when at normal engine operating temperatures. Under full engine operating temps, the viscosity improvers just cause the base oil to be more resistant to flow. They don't "thicken" the oil.
The confusion usually comes from folks thinking that viscosity is thickness. it is not. Viscosity is resistance to flow. Just because an oil gives the appearance of being thicker at a given temperature does not mean it is. It just means that it has a higher resistance to flow. All one needs to do is try and remember basic science classes from school. Sir Isaac Newton gave us the gravity stuff, but he also gave us viscosity and what it means. And it is a measure of resistance to flow.
There are even 10w30 synthetics that are literally straight 30w oils. Yet, they pass the test for CCS at -25C to quality as a 10w30. So you see, the number before the "w" is not related to weight, it is the rating of the oil when subjected to the Cold Crank Simulator test.
This might help....
What is Oil Viscosity a.k.a. Oil Weight? - oilspecifications.org
The confusion usually comes from folks thinking that viscosity is thickness. it is not. Viscosity is resistance to flow. Just because an oil gives the appearance of being thicker at a given temperature does not mean it is. It just means that it has a higher resistance to flow. All one needs to do is try and remember basic science classes from school. Sir Isaac Newton gave us the gravity stuff, but he also gave us viscosity and what it means. And it is a measure of resistance to flow.
There are even 10w30 synthetics that are literally straight 30w oils. Yet, they pass the test for CCS at -25C to quality as a 10w30. So you see, the number before the "w" is not related to weight, it is the rating of the oil when subjected to the Cold Crank Simulator test.
This might help....
What is Oil Viscosity a.k.a. Oil Weight? - oilspecifications.org
sixdogs
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Copperhead--that's a lot of good info there. How consistent in the resistance to flow of the label rating for oils? Are the resistance to flow numbers just sort of a guesstimate because they are widely variable or are they pretty much reliable? Are some more accurate than others? Are they generally accurate and do they change with mileage on the oil?
I wonder this because of the oil pressure numbers I see with various oils in various states of use in my vehicles. The synthetics seem more predictable and the dino often has lower pressure on the high end than when the oil was fresher. This is all new to me so I'm kind of slow on the lingo but hopefully learning something. Oil is far more specific than I thought.
I wonder this because of the oil pressure numbers I see with various oils in various states of use in my vehicles. The synthetics seem more predictable and the dino often has lower pressure on the high end than when the oil was fresher. This is all new to me so I'm kind of slow on the lingo but hopefully learning something. Oil is far more specific than I thought.
You are right. I think it was in 2006 they updated some VCT. They may be some small updates in later years.
What does the paper work that came with the engine say use for oil?
