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720Deere, the first sample was the second oil change, a dino/syn 15-40 Ford oil blend.
Some feel as you, that there is a true break in period, and that synthetics must not be used prior to a certain mileage, I don't subscribe to this. If it were so would not Ford, in large type, in many languages make this clear in the manual and under the hood?
In our manual Ford states that the 'break in' period is 1000 miles, page 3-diesel supplement, and they seem to encourage more frequent changes by saying that the oil should be changed NO LATER (also in bold in the manual) than the recommended mileage.
However it is a bit complicated because the owner is advised not to use 'friction modifier compounds' or special 'break in oils' during the first few thousand miles of operation so that the piston rings can seat, implying that some period of adjustment is necessary.
The numbers are pretty clear, lower and in most instances significantly lower wear numbers after going full synthetic.
Again, factory fill changed at about 700 miles-after driven from Elkhart, IN to North Carolina, semi syn by the local Ford dealer-who said it made no difference at all if you used full or semi syn, they only had the semi, then changed by me after about 3700 miles to full Amsoil synthetic.
The note for the Amsoil states:
Normal contamination and low wear levels found...