Originally Posted By: Jim Allen
Mag-Hytec wants you to fill to the top of the dipstick, contrary to the axle mfr's recommendation. I had a talk with the designer of the cover about that and he was adamant that the extra oil floods the tubes and cools and lubricates the wheel bearings better. He also claims it results in fewer axle seal failures. I tend to disagree but because I wanted to observe what effects his way may have had, I did it his way for several thousand miles. No ill effects. Nor any positive ones. I monitored oil temps both at the M-H level and Ford's level and didn't see a difference (sometimes high oil levels result in higher oil temps). I have ended up doing the same thing you did... midway between the marks.
I think it may need more oil because the Hytec has extra space for the oil to be thrown while the vehicle is moving.
Mag-Hytec wants you to fill to the top of the dipstick, contrary to the axle mfr's recommendation. I had a talk with the designer of the cover about that and he was adamant that the extra oil floods the tubes and cools and lubricates the wheel bearings better. He also claims it results in fewer axle seal failures. I tend to disagree but because I wanted to observe what effects his way may have had, I did it his way for several thousand miles. No ill effects. Nor any positive ones. I monitored oil temps both at the M-H level and Ford's level and didn't see a difference (sometimes high oil levels result in higher oil temps). I have ended up doing the same thing you did... midway between the marks.
I think it may need more oil because the Hytec has extra space for the oil to be thrown while the vehicle is moving.