LT1-LT4 Modifications 1993-97 Gen II Small Block V8

oil question

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Old May 19, 2007 | 07:09 PM
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I run regular oil right now, and I believe the car has had regular its entire life.

Would switching to synthetic cause problems because the car has had regular oil so long?

The car has 109,000 miles.
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Old May 19, 2007 | 07:42 PM
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I would say the first fill change the oil early at like 1000 miles instead of at 3000+ as should be normal. Some synthetic have stronger cleaning abilities and as they wash stuff free it will contaminate the oil and begin to fill the filter. Might even consider a filter change at 500 miles using inexpensive filters.

One time when I switched to a high detergent oil after a few hundred miles the valvetrain became rattly a filter change quieted it. My guess was the filter was getting restricted because it was filtering out all the cleaned up materials. The motor had not been neglected beforehand either. In hindsight wish I had cut open that filter to know for sure.

While on the oil change interval subject please don't feel that the 3000 mile rule is a good one, that is FAR shorter than what even the owners manual recommended for even the non-synthetic oils from a decade ago. Most guys who test their oil find that even with some spirited use 5000 is no problem exceptions would be dirty or constant short trip use.
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Old May 19, 2007 | 08:54 PM
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I dont see any problems, except it might clean up deposits which have collected in the mating surfaces of the engine, which can cause oil leaks. That is it.

Synthetic oil is good stuff. It far outperforms regular oil in every department. I say go for it. A slight leak is worth the benefits of the better protection from the better oil
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Old May 19, 2007 | 11:12 PM
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I have never found anyone that said that complained of anything other than the price diffrence, usually you get better MPG and maybe better proformance, it depends on what brand you use
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Old May 20, 2007 | 12:30 AM
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Originally Posted by Captainofiron
I dont see any problems, except it might clean up deposits which have collected in the mating surfaces of the engine, which can cause oil leaks. That is it.

Synthetic oil is good stuff. It far outperforms regular oil in every department. I say go for it. A slight leak is worth the benefits of the better protection from the better oil

how bad could the leaks get?
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Old May 20, 2007 | 12:36 AM
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depends on how compromised the seal was while running conventional oil, and how much "buildup" the synthetic oil cleans away from the compromised seal.
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Old May 20, 2007 | 12:33 PM
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but you guys think it would be worth it just to switch anyway?

i get more different opinions with the more people i ask
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Old May 20, 2007 | 01:22 PM
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depends. Tell us your driving habits? Highway driving? City Driving? How many miles do you go between oil changes, etc.
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Old May 20, 2007 | 03:49 PM
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most of my driving is very short trips with the occasional long trip. i change the oil at 2600-2800.

im not really that hard on my car, but i do have fun with it every now and then.
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Old May 20, 2007 | 04:12 PM
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IMO don't bother with synthetic unless you and your usage are willing to allow something closer to 5K miles. Yes synthetic can be better but the biggest advantage they have in street use is longevity, if you are not willing to let it shine there don't spend the extra coin.
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Old May 20, 2007 | 05:47 PM
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alright, that works then.
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