Snythetic Oil Question

[big white bufflo]

i had trouble with synthetic i have a 97 f350 7.3 140000 on the motor i went synthetic and the motor leaked bad so i went back to normal shell rotelia and no more leaks

[jyount]

Originally Posted by big white bufflo

i had trouble with synthetic i have a 97 f350 7.3 140000 on the motor i went synthetic and the motor leaked bad so i went back to normal shell rotelia and no more leaks

I had the same truck that had 125000 when I sold it. Bought at 69. Changed to rotella 5 40 synthetic at about 110000. No different except that sucker cranked up like lightning in the winter!

[tjfordboyesser]

i find the synthetic oils to work verey good and use them in all of my vehicles regardless of age or miles, for my ford vehicles i only use the motorcraft oil. i found that the recommended 5w20 that ford wanted me to put in my f150 was way to thin of an oil and made my engine run like shit after i hit 141,000 miles. i did some experimenting with oil mixes and found that 2 qts of 5w20, 3 qts of 15w40 and a qt. of lucas additive made my truck run alot smoother and with the use of a napa platinum filter i dont have to change my oil every 5k or 7500 miles. i change it ever 10k and it is only a light brown and not dark or black. im in the process of putting together an oil bypass system for the truck with a second filter that runs with the full flow filter but filters down to 2 microns. they use them on big rigs and it basically cleans your oil every 10 mins and you dont have to change your oil for 30k miles.