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77K Miles of Mobil 1 Synthetic

1K views 12 replies 8 participants last post by  300maximilien 
#1 ·
Heres what it will do to your engine.

 
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#3 ·
I dug into it for this:



Smelled oil cooking the other night, plug tube had completely filled, and was overflowing onto the valve cover. Replaced two of the three plug tubes, seals and v/c gasket.
 
#12 ·
I've seen this with full synthetics a lot. It leaves the inside spotless. A good synthetic blend gets close, only leaving a tin. I've personally opened two engines that used to run cheap oil, were sludged up, switched to synthetic blend, and were nearly spotless with a little tin here and there when I opened them up less than 10k miles later. I'm fond of Valvoline Max Life High Mileage and Motorcraft for their quality and price.

It is no lie that switching a high mileage engine with sludge to full synthetic can cause leaks. It takes the sludge off old seals causing them to seep. I reccomend a good blend to people who ask. It has less chance of leaks with the benifit of eliminating sludge.
 
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