Convert to fully synthenic motor oil. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-04-2005, 11:28 PM   #11
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Originally Posted by Kennginn
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Originally Posted by willwren
Not necessarily true. On higher-mileage motors, switching to synthetic CAN cause leaks. Not always, but it'* been known to.
i see that happen
You IL guys do seem good at killing the heartiest engine in the country.
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Old 07-04-2005, 11:47 PM   #12
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Originally Posted by BillBost37
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Originally Posted by Kennginn
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Originally Posted by willwren
Not necessarily true. On higher-mileage motors, switching to synthetic CAN cause leaks. Not always, but it'* been known to.
i see that happen
You IL guys do seem good at killing the heartiest engine in the country.
Heartier then an LS1?

If you change to syn, you'll be runing an oil with much more detergents in it, which cleans out your oiling system. It also unplugs holes that may be clogged with gunk. Is it worth it on an engine with 150k? I dunno. I switched @ 112 and got away with no problems. Synthetic doesn't break down at the end of it'* life like dino oil, which is the big selling point of it. It also does better in high heat situations.
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Old 07-04-2005, 11:51 PM   #13
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Originally Posted by BonneMeMN
Quote:
Originally Posted by BillBost37
Quote:
Originally Posted by Kennginn
Quote:
Originally Posted by willwren
Not necessarily true. On higher-mileage motors, switching to synthetic CAN cause leaks. Not always, but it'* been known to.
i see that happen
You IL guys do seem good at killing the heartiest engine in the country.
Heartier then an LS1?

If you change to syn, you'll be runing an oil with much more detergents in it, which cleans out your oiling system. It also unplugs holes that may be clogged with gunk. Is it worth it on an engine with 150k? I dunno. I switched @ 112 and got away with no problems. Synthetic doesn't break down at the end of it'* life like dino oil, which is the big selling point of it. It also does better in high heat situations.
Same reasons why I usually switch over....but the others have a good point also.
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Old 07-05-2005, 02:17 AM   #14
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My first 93 SSEi had 147,000 miles on it when i switched to Mobil 1, didnt leak before, and then it did, a decent ammount, ended up changing the pan gasket, which was one of the leaks but not all of them.
I would recommend dino juice for sure.
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Old 07-05-2005, 08:18 AM   #15
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I thinking I will go over to mobil 1 high milage oil I am sure that is blend oil. So how old blue likes it.
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Old 07-05-2005, 01:48 PM   #16
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i switched around 115k, just about 6 or 7 months ago (or was it longer? time flies) on my '96, and I didn't have an increase in my leakage . Since I changed my pan gasket (recommend, it'* easy enough if yours is leaking), I barely loose any between changes...
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Old 07-05-2005, 01:55 PM   #17
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I think it really boils down to, if your engine leaks with synthetic, the benefits of synthetic are all gone. Personally, Mobil One is one of THE best oils out there. Just pick some up, put it in, change the oil again at 3,000mi, then after that change do it again at 5,000mi. It will pay for itself after a few times of 5,000mil changes. Oh yeah, and if you get the 'new' mobil one with 5k, 7.5k, and 15k oil, pick up the 15k, it'* the full synthetic. If you have oil leaks within the first 3,000mi, then just switch back to regular oil.


-justin
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Old 07-05-2005, 01:58 PM   #18
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Quote:
Originally Posted by opensourceguy
If you have oil leaks within the first 3,000mi, then just switch back to regular oil.


-justin
I think you missed the point of the warnings. The leaks would be caused by the synthetic oil and detergents breaking down deposits and sludge that naturally plug or prevent leaks. After the change to synthetic, if it causes leaks, it'* because this buildup and sludge is GONE. Switching back to Dinosaur juice at this point would NOT stop the leaks caused by the switch to synthetic.
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Old 07-05-2005, 02:02 PM   #19
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As well if you considered going to one of the higher mileage Mobil'* you should definately use their filter. They plan their specs around it.
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Old 07-05-2005, 02:04 PM   #20
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I thought the synthetic leaks were due to it being thinner and could get through places easier?

The mobil one oil filter is one of the best out there, at least from the oil filter tests I have seen. Nothing compares . No matter the oil you use.


-justin
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