DTC P0300 Engine Misfire Detected - 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 05-01-2005, 02:23 PM   #21
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I'm soo tired of the Dex Cool vs Green info....

How much heat tolerance is a plastic gasket supposed to handle?

I can't say that dex is or isn't the cause of certain problems... But I have seen the Impregnated plastic gaskets fail on the 3800 L, 3800 K, 3100 M, 3100 J, 3400 E... Keep in mind that the3800 K, 3800 L and 3100 M through 95 all came with Green coolant...

I have been using the Dex Cool for just about 7 years now... I had the intake gaskets replaced after I bought the car, it had the green coolant in it.... Afterwards I swapped the thermostat for a 180F, flushed and installed Dex-Cool.... No leaks with the exception of a water pump better than 4 years ago... Showing signs of seeping through the weep hole.... Its about due...

My 91 killed its original Water pump in the low 90,000 mile range, It always had green coolant in it and still does... The weep holes were leaking good...

My 95 killed of its original water pump at 89,000 miles.... Had Green up untill 75,000 or so... Oh it wasn't the seals that died, it was the bearings... Made some nasty noises...lol

I think the largest problem is that air can not be in the system with Dex Cool and it can't be mixed with the Green stuff( Unless noted on the Bottle, Compatible with Dex-Cool )

But if you do want to dump the Dex-Cool, just get a Longlife coolant... I have Prestone longlife in the Mitsubishi( Compatible with Dex )...

I have Prestone Green in the 91( I believe its also Longlife, Don't think its compatible with Dex Tho)

And the Dex in the 95 has been there for a long time... Everything looks like New, Even the Radiator... 139,000 miles and still going...

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Old 05-01-2005, 02:28 PM   #22
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Quote:
Originally Posted by Wargamer
Got the NGK Iridium TR55IX plugs in, a new set of AC DELCO wires (lifetime guarantee on those), PCV Valve, and the 180 drilled thermostat installed.

Runs like a champ now!

I'll get some pics up of those old Bosch plugs. Some of the old wires had charcoaled themselves... pure junk. I think it was a combo of the plugs and wires.

BTW, what'* everyone'* opinion on DEX COOL? Should I replace it with the green stuff?
I too had plenty of problems with the Bosch wires and plugs.... I tossed them out as file 13....lol

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Old 05-01-2005, 02:39 PM   #23
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Quote:
Originally Posted by jr's3800

And the Dex in the 95 has been there for a long time... Everything looks like New, Even the Radiator... 139,000 miles and still going...
I've never seen dex in my 95? Don't even think there'* stickers for Dex in mine?
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Old 05-01-2005, 02:40 PM   #24
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Quote:
Originally Posted by LakevilleSSEi
Quote:
Originally Posted by jr's3800

And the Dex in the 95 has been there for a long time... Everything looks like New, Even the Radiator... 139,000 miles and still going...
I've never seen dex in my 95? Don't even think there'* stickers for Dex in mine?
I flushed it in early 98 and used the Dex..... Still have dex in there now...

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Old 05-01-2005, 02:43 PM   #25
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ahhhh I see.... Make'* sense then. Now why did you flush it to Dex-Cool?
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Old 05-01-2005, 02:47 PM   #26
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Quote:
Originally Posted by LakevilleSSEi
ahhhh I see.... Make'* sense then. Now why did you flush it to Dex-Cool?
I wanted long life coolant like they used in the factory.... The Dex is also supposed to have better cooling properties... Dex was first used in 96 for GM'*.... No one really knew much about it... But I'd still use it.... If and when i get around to replacing the almost 6 year old upper intake I will use Dex again..

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Old 05-01-2005, 02:57 PM   #27
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Quote:
Originally Posted by Wargamer
Ok, The guy at Advanced Auto said that GM is recommending to replace DEX COOL with green.... because the DEX COOL was eating the gaskets and such.

As a matter of fact, the previous owner had the green stuff in the car. I replaced it with DEX COOL when I put the thermostat in this weekend.


So, what'* the official word here?
The guy at Advance Auto is lying his *** off to you, or is grossly misinformed. GM does NOT reccomend changing from Dex-Cool to green.
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