your mechanic to replace the solenoid.
For your other question as to why it is called a torque converter I must say that baffles me as well. Torque is measured as turning force. In our case a turning force is being transferred through a body of fluid and applied to the input shaft as: Torque! I think a better term would be torque multiplier if you think about it.
How many miles should I reasonably expect to go between oil changes if I use synthetic oil?
The same amount as with any oil, in my opinion, and here is why. The primary reason oil needs to be changed is contamination. This contamination comes from burning fuel in the engine. With each combustion cycle a tiny amount of carbon, unburnt fuel, water, and other oxides are carried down into the crankcase by the piston rings. Over time these break down your oil into sludge. A good oil filter will, at best, be able to filter out the largest pieces. The rest will begin to eat away at bearings, rings, cylinder walls, etc. The true benefit from using synthetic oil is its ability to withstand heat. If for some reason you overheat your engine there is a much greater chance you will not destroy vital moving parts.
JB Griffin owns and operates JB's Auto Sales and Service in Evensville, Tennessee. You may see him weekly on the WDEF-TV News 12 Morning Show every Tuesday at 7:10 a.m. where he will answer your car care questions live and on air. Visit him on the web at: www.500overcost.com