Quote:
Originally Posted by Chris B.
Its the weight of oil that the variable camshaft timing system was designed for. Some people that switched to 5W-30 or heavier weight oil have had issues with the VCT system not working correctly with the heavier oil. The oil analysis of the Motorcraft 5W-20 showed that even after 6,8000 miles, four days at the track(several hundred miles on road courses) and a couple trips of the dragstrip, the oil held up fine and could have lasted longer.
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Really? Have you seen this:
http://corner-carvers.com/forums/showthread.php?t=36607