I just had my E4OD rebuilt. The rebuilder recommends Synthetic Fluid. I had been using Dexron/Mercon in the past. I can't find Synthetic Dexron/Mercon.

What type should I use?

 

Mobil 1 synthetic ATF is very good.

 

DEXRON/MERCON are outdated, discontinued ratings. MERCON V has replaced MERCON. Mobil 1 synthetic ATF is VERY, VERY good fluid and has a MERCON V rating.

 

Should I replace the old ESP-M2C83-C automatic trans fluid that is in my Single Rail Four-Speed Overdrive with Mobil 1 synthetic ATF? If a Former Automatic Transmission Engineer says too, that would trump a transmission guy at a local shop? Mark Kovalsky,
Do you think that is Mobil 1 synthetic ATF is what I should replace the old stuff with???

 

That spec is for an 80 weight gear oil. ATF will KILL this transmission! Do NOT use ANY ATF, even synthetic, unless you just want to find out how fast you can kill the trans.

 

What about synthetics in high mileage transmissions? I just put ATF in my C-6 with a 194,000 miles on it..and it isn't working properly.

 

Synthetics or not synthetics only matters in how much money it costs to buy it. Synthetics can ALWAYS replace conventional fluids AS LONG AS THE RIGHT FLUID SPECIFICATION IS USED.

If you put a MERCON V synthetic in a C6 that requires Type F ATF that trans will fail in a VERY short time. On the other hand, if you put conventional MERCON V fluid in that same C6 it would also fail in a VERY short time. MERCON V is "slipperier" than Type F. Conventional MERCON V is EXACTLY as slippery as synthetic MERCON V.

Mileage is not a factor in the decision whether or not to use synthetics.

 

Is this the wrong stuff?

Valvoline MaxLife Dextron/Mercon (ATF) Automatic Fluid (1 Gallon)


[IMG]Trafile:///C:/Users/Bobcat/Downloads/8150020_mxl_773775_pri_detl.jpgnsmission[/IMG]

 

Bobcat,

You posted a link to a file on the C drive of your PC; nobody but you can see it. Is it possible to post it on a public web site?

 

I went to my local auto store and bought the right stuff. The Pic I tried to post was a fluid with both Mercon and Dextron...I purchased Mercon only this time...now I have about 5 hours and $ 80 into this....instead of coming here and asking from the get go

I appreciate the responses , thank you...now I'm fighting the line going into the radiator...

 

What year is your C6? Is it original or has it been rebuilt?

 

Original, 1995....194,000 miles...plus I drove it from Key West to Clearwater and back last week for the races (SBI) which probably put a little strain on it

 

Yes, that is the right fluid for that trans. Older C6 transmissions used Type F, but a 1995 would use MERCON.

 

I read this to mean that synthetics do not provide extended service intervals.

By which criteria should one consider synthetic over conventional, if not extended intervals? That is to say, what is the advantage?

or am i misinterpreting?

also, on the C6, my 79 calls for mercon, is mercon V compatible that far back? And can it be safely mixed with mercon of unknown age?

 

I meant that there is no mileage limit on an engine or trans where you can switch to synthetics. I've heard many people say that you should never switch if you have more than XXX miles or it will grenade. That's just not true.

I prefer synthetics when the vehicle is worked hard. If it is used as a commuter/grocery getter then I don't see any benefits from synthetics.