Quote:
Originally Posted by THEFERMANATOR
Fuel pump? Slow starter from too thick of oil?(couldn't resist) The 91+ SBEC and JTEC should be able to start in about 2 revolutions of the crankshaft. My 88 takes a little cranking to get going due to the magnetic pick-up and sync set-up.
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yep been there too with my old wrangler i had with the 4.0. the reason why syn oils tend to leak rather than dino oils is due taht syn oils molecules are pretty much uniform in size and that size just happens to be smaller than dino oil. where as dino oil has larger molecules with some smaller molecules but with larger unrefined ones in the mix therefore using the theory of blind probability there are more larger molecules at a given point than smaller ones with the dino oil. here is the kicker there is a difference between regular syn mobil one and high mileage full syn mobil. that difference is seal swellers. check out mobil's website they admit putting them in the high mileage, because that is how to keep the small molecules inside the crankcase with out putting new seals in. and not all the time will re sealing work becuase of the metal rotating part being worn from the old seal sort of a devil's advocate of friction and erosion. in other words if you want to run syn on an older motor get the high mileage stuff.