1994 Supercharged Mustang GT

What's your location btw?

Instead of using a 10w-xx, try using a 5w-xx or 0w-xx oil for winter. The 5w will pour/flow easier at cold temps, but once both types of oils reach operating temp, they will have similar flow properties. This could help with getting oil pumped around during "cold starts," especially with infrequent starting.

Or you could find a way to circulate the oil before you start the engine - priming it, but that's really overkill unless you are building up a new motor.


Any quality 5w-30 oil should suffice. No need for a 20 weight oil IMHO. And if you need a few more mpgs, switching from a 30 to a 20 weight oil alone isn't going to show any real significant savings.


You're better off minding the air filter/plugs/wires, maintaining proper (or slightly higher) air pressure in the tires, removing un-needed items from the passenger/trunk compartment for weight savings, and altering your driving habits.

Changing the way you drive may include: no jackrabbit starts, not flooring it and keeping heavy throttle application to a minimum, anticipating red lights/stops ahead, using cruise control on the freeway, driving much more conservatively, etc. Google "hypermiling" and you'll find a bunch of other ways to make a dent with your fuel economy. Just remember, it's a mustang, not a prius.


YMMV