Convert to fully synthenic motor oil. - Page 3 - 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 07-05-2005, 02:07 PM   #21
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Synthetic 5-30 is the same as dino 5-30 for viscosity out of the bottle. it'* over time and miles that dino breaks down and loses viscosity where synthetic retains it'* viscosity.

Hence synthenitc does not break down and get thinner. Dino does and hence your oil pressure drops off w/dino.
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Old 07-05-2005, 02:14 PM   #22
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Quote:
Originally Posted by opensourceguy
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.


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It has nothing to do with viscosity, as stated above. It'* simply an issue of sludge and buildup. If it causes leaks, there'* no point in switching back to Dino juice.
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Old 07-05-2005, 02:18 PM   #23
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Okay, well then.. alright. Guess a blend would be good. Maybe a High-Mileage synthetic. Valvoline has some, I think.


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Old 07-05-2005, 08:48 PM   #24
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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'll 2nd that. A friend of mine has a 97 Cougar. He switched over around 95K and has alot of leaks. Mine has not burned any oil and no leaks (knock on wood) since I got it two years ago.
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Old 07-05-2005, 11:41 PM   #25
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dont u guys worry about not seeing an intake leak fast enought cuz wouldnt he first sign of the bad intake be antifreeze in the oil? if so u wouldnt see that very soon if u changed every 6,000 other then 3,000?
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Old 07-05-2005, 11:43 PM   #26
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The first indicator will be a lower level in your coolant reservior. And checking the oil should be more frequent than changing it, especially for the L36 crowd running OEM UIM'*.
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Old 07-05-2005, 11:45 PM   #27
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i dont mean to get off topic but i have a quick question: when u cheak ur oil with the dipstick what will u see if u have a intake leak?
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Old 07-05-2005, 11:46 PM   #28
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Chocolate milk. No kidding. And check it hot.
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Old 07-05-2005, 11:48 PM   #29
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I've seen white foam before...but that was really small amount of condensate
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Old 07-05-2005, 11:51 PM   #30
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man im so scared of my intake failing i really dont wanna spend all that money at a dealership and i cant drive a broken car to my dads across state to fix it either.
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