C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Synthetic or regular oil?

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Old Jul 10, 2005 | 10:11 PM
  #21  
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If a leak starts fix it!. This means the synthetic oil is cleaning out deposits in the engine. A clean engine means longer life. My 95 engine has 120 k and looks and sounds like new using synthetic.
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Old Jul 10, 2005 | 10:44 PM
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Originally Posted by bogus
If you get a lot of leaks, switch back. No harm done.
It finds leaks by cleaning the gasketed surfaces. They don't go away, at least not quickly. Mine never leaked a drop until I switched to synthetics. I don't think synthetic serves any realistic advantage over a quality dino oil changed regularly.
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Old Jul 10, 2005 | 10:47 PM
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Do you guys know of any changes in gaskets or tolerances over the years? I know the old cork gaskets tend to leak synthetic like a sieve.
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Old Jul 11, 2005 | 01:11 AM
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When do you switch over to a synthetic in a new motor? I have right at 1100 miles on my new motor! Presently use Valvoline 10-30.
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Old Jul 11, 2005 | 08:14 AM
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I use Mobil1 5W30 in my 1988 'Vette. She's got 95,000 miles and I change the oil every 5000 miles. No leaks, No problem.
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Old Jul 11, 2005 | 08:16 AM
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The switchover from Dyno for a fully synthetic may give you another 82000 miles. Make the switch, its a no brainer.
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Old Jul 11, 2005 | 08:54 AM
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Originally Posted by Movnviolation
When do you switch over to a synthetic in a new motor? I have right at 1100 miles on my new motor! Presently use Valvoline 10-30.
I switched over at 500 miles. My motor doesn't burn any oil. I change it about every 4-5k miles or one year depending on usage. I also use a K&N filter. I have about 50k miles on my motor since having it rebuilt into a stroker.
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Old Jul 11, 2005 | 01:35 PM
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The reduced friction will give you a slight MPG increase. That alone could pay for the price difference.
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Old Jul 11, 2005 | 02:49 PM
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Originally Posted by L98Corvette
Hey guys, my car has 82,000mi on it, i am considering synthetic but im afriad of leaking oil, its not leaking now but what do you guys think i should go with? Thanks

Synthetics do not directly cause leaks. Their molecules are much smaller and consistent than "dino" oil and are better at finding places to leak from. In addition, synthetics have a high level of detergents which may actually clean away deposits that were hiding those little secret leak spots. If leaks are your worry, try the new Valvoline Full Synthetic MaxLife. I sell it, I trust it, I believe in it and I run it in my Vette and truck. My 99 Z71 has over 160,000 EXTREMELY hard miles on it and I don't leak or burn a drop of oil. If a huge leak develops, either fix it or try regular MaxLife which has a lot of semi-sythetic qualities.
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Old Jul 11, 2005 | 03:02 PM
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My money's on the synth. Yeah, it's that good.
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Old Jul 11, 2005 | 03:06 PM
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Originally Posted by CentralCoaster
Do you guys know of any changes in gaskets or tolerances over the years?
LT1/LS1 are designed and built with much tighter tolerances, which is why they can use Syn from the factory without having ring issues.
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