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Re: Oil Viscosity for DOHC Ford
Yes very interesting information. I had always thought (and heard) that the reason for the 5W20 was the tighter tolerances of the modern DOHC motors as well as greater MPG. At one time I even ran 0W20 Mobil One in my engine. In 70,000 miles I never had any problems and each oil change made me wonder as the oil was the consistency of water when I drained it. I always used a full synthetic like Mobil One and changed it every 5,000 miles. The Shelby GT-500 DOHC 5.4 motor calls for a 5W-50 weight oil. It's a very difficult weight oil to find locally and I've had to order it on-line. Doing the oil change myself still cost me over $100 bucks each time.
The Shelby guys are very "anal retentive" about small details on their cars and many send their oil to labs for analysis. From what I can gather, Royal Purple and Redline are usually the highest rated in the 5W-50 range. Motorcraft’s 5W-50 synthetic is down around fourth or fifth on the order of preference of oils for Shelby GT-500’s.
Good info, thanks.
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