I have a 1994 Ford Tempo with the 2.3 4-cylinder engine and im wondering if i could use Shell Rotella T 15w-40 with no problems? The reason i want to use a thick oil is cuz my car needs it cuz for one it has about 180,000 miles(maybe higher?) on the engine and the rings are going bad in it cuz i have bad compression and blowby in my air intake box (im not the orginal owner of the car so lord knows what its been thru). The other thing is i do a 3-4 hour long NEWSPAPER ROUTE every day. so far the car is still kicking after adding 20,000 miles of stop and go newspaper delivery. Right now im using Castrol High Milage 10w-40 but after reading up that 10w-40 oils have less lubrication and more tendency to sheer than 15w-40 oils, i definitly want to switch. I dont want to use a 20w-50 oil cuz i want good gas milage. So my options are Shell Rotella T, and well Shell Rotella T! For some unknown reason this is the only 15w-40 oil available in my area!( I live in West Virginia) and its sold at a Gomart for crying out loud! Anyways i was just wondering if this oil and a Motorcraft FL-1A oil filter would be a good combo for my car?