i have a 3.9L dakota, low mileage, and have developed a front main seal leak, after about 300 mi., and 2 weeks of using GC. i had M1 10w-30 in it, and developed a tappet noise, and went to GC when i heard all the good things about it. the manual says to use 10w-30, and i saw a chart here stating that the VI of GC was between that of M1 5w-30, add 10w-30, and tried it. since you people are the GC gurus, is it possible that the GC is too thin for my motor, and caused the leak? the engine is mechanically sound. thankyou.
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