Should I stick with stock Mercon or go with a synthetic? Also what is a total fill on a 4r100? 14 quarts? thanks Jeff

 

unless your planning on having the tranny completely flushed, stick with stock Mercon.

Mixing the two is not a good idea.

There are varying opinions on this as to 'which is better.' Stock Mercon for me.

Not sure on the total capacity.

 

I thought some guys here have had excellant results with synthetic. With the plug in the torque convertor I think we can get most of the old fluid out... Just thought I would check. I do have a B&M pan so the draining of the pan is easy... thanks

 

I have run Mobile 1 synthetic since 1k miles, I now have 14k. My truck has performed excellent with no transmission problems I took mine to one of the quick change oil places where they used a machine that completely pumps out all the old and fills it with the new. Sorry but I don't remember how many quarts it took.

 

Mobil1 Synthetic 0W-30

 

Mobil1 Synthetic ATF for about 20k miles now. No problems yet.

 

 

Try it.

 

It works just don't drag race it.Fine for open road and open track actually better because of the anti fricton properties.Shifta are a little softer but less loss in HP and runs cooler.Stan

 

So which fluid is good for a daily driver/weekend racer (1/4 at a time for me!)

 

I have always been a "Motorcraft Mercon" kinda guy myself, but I heard an engineer who I have a lot of respect for say Mobil 1 is the best there is.

G

 

Enough said. Thanks