Engine Oil

Great read about oil wieghts.
 
http://www.synlube.com/sae5w-20.htm

I have been using only 20-50 weight oil in all seasons and climates for over 30 years, even winter...also have used it used in racing engines. Changed oil every 3000-3500 miles faithfully....or after each race. My 1989 Montero has passed 200,000 miles; never any lubrication problem or failures in engine since it was new and no leaks....quiet and great compression! I figure that oil is a lot cheaper than steel...even these days!! Good luck with your Mit!

Interesting reading.  My 02 MustangGT requires 5W-20W oil.  We have decussed this on our Stang board many of times.  Must of us use 5-20 as stated by Ford.  The 4.6V8 engine is considered a "close tolerance" engine like many today.  According to Ford, we must use 5-20 to adequately libricate the engine.  To me, it comes down to changing oil on a regular basis and proper maintenance of the vehicle.  Pearl02