Join Date: Apr 2001
Location: Helena, MT
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Re: Fully synthetic or Dura-blend?
I've heard that it shrinks the gaskets causing leaks,
It doesn't shrink the gaskets.
The leaks show up because it's so much slicker (more viscous) than regular oil.
Regular oil, over time, will attack the gaskets (especially the cork ones) and basically eat at them till there's nothing left.
What keeps the engine from leaking oil is sludge build-up around those gasket voids.
A lot of times, swapping in fully synthetic oil (or, even a high detergent oil, like Kendall) under those conditions,
will clean out the sludge, and leak past the voids in the gaskets. [img]images/graemlins/frown.gif[/img]
Synthetic oil on the other hand, does not attack gaskets what-so-ever.
If you start using it, once the engine is broken in properly, you'll never develop any oil leaks. [img]images/graemlins/cool.gif[/img]
Your's at 68,000 is just getting to the edge of not taking kindly to fully synthetic.
You'll probably develop leaks.
Valvoline Dura-Blend (semi-synthetic) is great stuff, and should work excellent in your case.
I think you'd be surprised by running an oil change with that.
What brand/weight have you been using?
I use Mobil 1 exclusively.
But, that's because I started using it after a proper 6,000 mile break-in period.
It flows extremely well in our cold temperatures here in the winter.