Quote:
Originally Posted by Detroit Bill
I believe there are several arguments. Some were mentioned in this tread already by knowledgeable engine builders.
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those arguments are likely based on outdated thinking, not on fact. The heavier synthetics such as Mobil 1 15w-50 & Mobil 1 0w-50 are very well suited for Ford FE engines & the FSB's as well.
If your FE leaks with a
synthetic oil, it indicates your seals were holding deposits and need replacement. That's not the fault of the
oil. In any case, such seepage usually goes away once the
oil has reconditioned the seals, if not, replace the seals, not the better oil.
2 cents,
Z.