Best Oil? Carbureted '89 Firebird
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Junior Member
Joined: Sep 2019
Posts: 4
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From: Ohio
Car: 1989 Pontiac Firebird
Engine: V8, CSM 305
Transmission: Stock (for now...)
Axle/Gears: Stock (for now...)
Best Oil? Carbureted '89 Firebird
I know that Oil is a really important element for my car, and right now I'm using Valvoline 10W-30.
However, I've gotten some people telling me that Mobil 1 is a better option for carbureted engines.
How does a carbs needs differ from Fuel Injection in terms of oil?
Recommendations?
Thanks!
AvianWing
However, I've gotten some people telling me that Mobil 1 is a better option for carbureted engines.
How does a carbs needs differ from Fuel Injection in terms of oil?
Recommendations?
Thanks!
AvianWing
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Best Oil? Carbureted '89 Firebird
Carbs like to foul the oil with tons of unburned fuel - especially on cold start. This leads to dramatically shorter engine life from fuel dilution and cylinder washing and there's really no oil that's going to stop it. Whatever you use it should be changed often. I would buy an inexpensive synthetic and change it at least every 2500 miles since this is obviously an aftermarket carb that likely has some pretty rich tuning and none of the 80's advancements such as the E4ME Q-Jet had that would reduce fuel dilution, etc.
Best thing you can do for engine life and oil life is put the fuel injection back on.
GD
Best thing you can do for engine life and oil life is put the fuel injection back on.
GD
Supreme Member




Joined: Sep 1999
Posts: 3,042
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From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: Best Oil? Carbureted '89 Firebird
Here in the 21st century, oil brands don't matter. Use the proper rating & viscosity, and change oil when it needs to be changed. The intervals depend on how the car is used, environment, etc. It's not a "one size fits all" number. I see no point in running a synthetic in a high-mileage engine, but that's just me...
Last edited by T.L.; Oct 24, 2019 at 05:38 PM. Reason: Typographical error
Supreme Member
Joined: Feb 2006
Posts: 1,777
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From: Sanctuary state
Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: Best Oil? Carbureted '89 Firebird
EVery day this comes up on every forum. There is no magic oil period
Pricy cheap doesnt matter..as said keep it clean and use a good filter.
None will magically give you tons more life than the other. I run cheapo oil for my daily and a wix filter almost 200k and runs like a top.
Pricy cheap doesnt matter..as said keep it clean and use a good filter.
None will magically give you tons more life than the other. I run cheapo oil for my daily and a wix filter almost 200k and runs like a top.
Joined: Jan 2002
Posts: 1,434
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From: Dallas
Car: 1982 Trans Am KITT Replica
Engine: LU5 305 CROSSFIRE
Transmission: TH-350
Axle/Gears: Limited Slip 3:23
Re: Best Oil? Carbureted '89 Firebird
Advanced auto parts is clearancing out 10W30 Mobil Synthetic DIRT cheap
Dave
Dave
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Joined: Jun 2003
Posts: 5,028
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From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: Best Oil? Carbureted '89 Firebird
EVery day this comes up on every forum. There is no magic oil period
Pricy cheap doesnt matter..as said keep it clean and use a good filter.
None will magically give you tons more life than the other. I run cheapo oil for my daily and a wix filter almost 200k and runs like a top.
Pricy cheap doesnt matter..as said keep it clean and use a good filter.
None will magically give you tons more life than the other. I run cheapo oil for my daily and a wix filter almost 200k and runs like a top.
While none are magic is correct there are differences between oils that, depending on your usage, can make a difference.
Supreme Member




Joined: Sep 1999
Posts: 3,042
Likes: 822
From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: Best Oil? Carbureted '89 Firebird
Any "difference" is negligible...
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: Best Oil? Carbureted '89 Firebird
For a grocery-getter, sure.
I think you could stand to do some more reading on engine oil tests. Here are two quick and good reads by AMSOIL
http://wpc.1c96.edgecastcdn.net/001C...ml5/index.html
http://wpc.1c96.edgecastcdn.net/001C...ved/index.html
I think you could stand to do some more reading on engine oil tests. Here are two quick and good reads by AMSOIL
http://wpc.1c96.edgecastcdn.net/001C...ml5/index.html
http://wpc.1c96.edgecastcdn.net/001C...ved/index.html
Senior Member
Joined: Mar 2017
Posts: 902
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From: waterloo ontario
Car: 1986 trans am
Engine: 305/350
Transmission: 5 speed
Axle/Gears: 3.27
Re: Best Oil? Carbureted '89 Firebird
the consensus is "it isn't the type of oil you use" (and in older,higher mileage carbed vehicles i personally would not use synthetic)
" its the matter of changing it at or before the recommended frequency with an oil filter that DOES NOT SAY FRAM ON IT..."
(worst filters made,period)
" its the matter of changing it at or before the recommended frequency with an oil filter that DOES NOT SAY FRAM ON IT..."
(worst filters made,period)
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