#additive

Dan R writes:

Hello Sajeev,

I have a transmission related question that I was hoping you may be able to assist me with. I have a 2003 Mustang GT, 4.6, Auto. 110k. (3rd owner) The car has the occasional classic Ford “AOD trans shudder” at lower RPM under load.

It does not really affect the overall drivability of the car but is an annoyance and I’d like to take care of it. As far as I know this car has never had a trans service done. I’ve heard mixed reviews on weather to do a trans flush or not.

Eric writes:

I have a 2000 Maxima with about 155k on the clock. I purchased this car in Los Angeles and since 2005, it’s lived in Ohio and Pennsylvania. The main issue is that I can tell the transmission is starting to get a bit soft on the 1-2 upshift, specifically once it starts getting cold out. I presume the primary reason for this is the abuse it’s suffered at my hands. As it was a California car, it has no traction control and though I love it nine months of the year, it is utterly helpless in the snow—snow tires didn’t seem to help tremendously. I’ve had to rock myself out a number of times and I presume the trans has gotten overheated at least once. I’ve been good about changing the fluid (drain and fill 3x, filter too) about once a year but I think I’m near the end on this trans.

Well, the good news is that the EPA has thus far refused to allow gasoline blends of more than ten percent ethanol. The bad news is that the Agency has yet to take a firm stand against the idea of eventually allowing E15 into the nation’s gas pumps. In fact, as the EPA’s response to the ethanol lobbying group Growth Energy’s request to allow E15 [ full document in PDF form here] opens:

It is vitally important that the country increase the use of renewable fuels. To meet that goal EPA is working to implement the long-term renewable fuels mandate of 36 billion gallons by 2022. To achieve the renewable fuel requirements in future years, it is clear that ethanol will need to be blended into gasoline at levels greater than the current limit of 10 percent.