synthetic oil - 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 01-28-2008, 09:34 PM   #1
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Does anybody use synthetic oil in their bonnie if so can i get some feed back?
what is a good spark plug and wire combo? I will get some pics of my bonnie up soon for all to see.Still stock looking for ideas.
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Old 01-28-2008, 09:44 PM   #2
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if you are n/a then i would suggest using the delco iridiums. i had those in my 92 n/a for over 60k and they were still good. but if you are */c id go with either the delco resistor or ngk tr55.

ps, if you put a brief description of ur vehicle it would make it easier for us to answer your questions.

and Welcome to BC.
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Old 01-28-2008, 09:45 PM   #3
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techinfo and search are your friend
a lot use the NGK TR55s

synthetic oil is fine, just make sure the trans. is in good shape, and stick with trans or conventional, don't alternate.
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Old 01-28-2008, 09:57 PM   #4
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I run Mobil 1 10W-30 synthetic with Lucas Synthetic addative in my motor after the rebuild. And I run Mobil 1 synthetic ATF in my freshly rebuilt trans. Love em both. Im a big Mobil 1 fan.
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Old 01-28-2008, 09:58 PM   #5
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sorry my bonnie is n/a and like i said still stock old man had it took good care of it no rust etc.
i just want to take better care because she is a diamond in the rough.i am really impressed with the bonnie.i owned four cutlass supremes 2 door and i loved them.but the 98 se ranks right up there.
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Old 01-28-2008, 10:28 PM   #6
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Yes, many of us run Synthetic. I've run Mobil 1 in my Cutlass Ciera, '89 Bonneville, and '93 SE. And M1 is going in my truck TOMORROW.

Also, besides oil, maintaining your transmission is the best thing you can do for your bonneville. Flush your transmission every 25k and have its filter replaced. Best preventative maintenance.

SO, Mobil 1 and a PureONE filter for oil...

now for ignition.

Napa Belden, or Autolite Pro for wires, and NGK TR55 plugs gapped @ 0.060"
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Old 01-28-2008, 11:07 PM   #7
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Mobile 1 especially good if you live in the north. Cold weather has no affect on the viscosity. WalMart has the 5 quart jug for $20.00.
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Old 01-28-2008, 11:12 PM   #8
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mobile one is what i run. car seems to like it
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Old 01-29-2008, 01:42 AM   #9
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Looks like i go against the grain a little here, I have been running Wal-Marts Supertech Synthetic 10-30 with very good results, and I use a Puroilator filter.

for plugs I am presently running ACdelco replacements, and NGK plugs of some sort.
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Old 01-29-2008, 09:09 AM   #10
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bull44, please edit your profile and put your car information in your signature. It'll help us help you later.

Synthetic is fine as long as you don't use garbage (FRAM) oil filters.

Synthetic ATF is not suggtested for a higher-mileage trans.
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