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#1645328 - 10/25/09 02:14 PM Oil for 2005 Impala w/ 3.8 Series II
04SE Offline


Registered: 05/04/07
Posts: 520
Loc: Central IL
Ok, this motor for years was spec'ed with 10w30 by GM and ran for a very long time. They are extremely reliable. My 05 impala has a 5w30 oil cap. I have ran 5w30 for 25K and have not had a problem.

Did anything in the L36 change for GM to recommend 5w30 or is this their way of getting more MPG across the fleet like Ford did with 5w20?

I have a stash of Shell 5w30 that I had intended on using up in this car but with Pennzoil Platinum and M1 coming back down in price, I might switch it over to synthetic. Just wondering what grade to run for the next 100K. I am really interested in M1 0w30.
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2002 Avalon XLS | 1MZ-FE | 104,000 | Travellers Synthetic 5w30
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#1645341 - 10/25/09 02:34 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: 04SE]
wapacz Offline


Registered: 11/21/05
Posts: 925
Loc: MI
5w is just your cold flow number. Pretty much means you can start the car in colder temperatures and still be fine.

The change probably happened because oils got better. The oils got more shear stable which made making the 5w30 easier. If we ever find a way to make cheap shear stable 0w30s I bet those will be come recommended from oem, but for now they require synthetics and that makes them expensive.


Edited by wapacz (10/25/09 02:39 PM)

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#1645355 - 10/25/09 02:45 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: wapacz]
daves87rs Offline


Registered: 02/23/09
Posts: 13243
Loc: Michigan
Originally Posted By: wapacz
5w is just your cold flow number. Pretty much means you can start the car in colder temperatures and still be fine.

The change probably happened because oils got better. The oils got more shear stable which made making the 5w30 easier. If we ever find a way to make cheap shear stable 0w30s I bet those will be come recommended from oem, but for now they require synthetics and that makes them expensive.


+1
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#1645418 - 10/25/09 03:55 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: daves87rs]
Petrou Offline


Registered: 01/27/09
Posts: 435
Loc: Bismarck, ND
it will be ok to run 10w-30 but i would stick with 5-30 for cold like it said above. or 0-30. or really that motor likes synthetics as well
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1992 Chevy 4x4 350 5 spd

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#1645455 - 10/25/09 04:31 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: Petrou]
sciphi Offline


Registered: 03/24/07
Posts: 8293
Loc: Upstate NY
I have a 1999-spec 3800 Series II. It runs fine on 5w-30. I have dino in there right now since it was in the stash. It's seen a little bit of 10w-30 and lots of 5w-30 since it sounds better on startup with 5w-30.
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#1645536 - 10/25/09 05:29 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: sciphi]
daman Offline


Registered: 09/23/06
Posts: 10439
Loc: Bad Axe, MI
ive had two NA 3800's both took 5w30
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"Always"....Mobil 1

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#1645547 - 10/25/09 05:35 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: 04SE]
Merkava_4 Offline


Registered: 01/30/07
Posts: 8805
Loc: Clovis, CA
I would ignore the 5W-30 oil cap and run 10W-30 Maxlife.
A 10W-30 oil cap is readily available for that engine.

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#2698104 - 07/28/12 03:46 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: 04SE]
Ram01 Offline


Registered: 10/13/10
Posts: 575
Loc: New York Queens
10w30 Mobil 1 will be fine

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#2698224 - 07/28/12 06:16 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: 04SE]
Nickdfresh Offline


Registered: 03/15/06
Posts: 3202
Loc: Buffalo, NY
Originally Posted By: 04SE
Ok, this motor for years was spec'ed with 10w30 by GM and ran for a very long time. They are extremely reliable. My 05 impala has a 5w30 oil cap. I have ran 5w30 for 25K and have not had a problem.

Did anything in the L36 change for GM to recommend 5w30 or is this their way of getting more MPG across the fleet like Ford did with 5w20?

I have a stash of Shell 5w30 that I had intended on using up in this car but with Pennzoil Platinum and M1 coming back down in price, I might switch it over to synthetic. Just wondering what grade to run for the next 100K. I am really interested in M1 0w30.



0W-30 AFE would probably work great. These engines run fine on either 10W-30 or 5W-30 and my old 1990 Buick LeSabre 3800 actually called for 5W-30. I'd use the Formula Shell in the warmer months and try the 0W-30 in winter...

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#2698259 - 07/28/12 06:52 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: Ram01]
tsduke Offline


Registered: 10/27/10
Posts: 128
Loc: Iowa
Wonder if the OP has the car anymore. Post was almost 3 years ago.

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#2698369 - 07/28/12 08:40 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: 04SE]
Ram01 Offline


Registered: 10/13/10
Posts: 575
Loc: New York Queens
That's true but plenty of people on this forum may have the wonderful 3800 series from GM. And want info on which grade to use

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#2698463 - 07/28/12 10:22 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: Ram01]
oldmaninsc Offline


Registered: 09/25/06
Posts: 1199
Loc: California
Originally Posted By: Ram01
That's true but plenty of people on this forum may have the wonderful 3800 series from GM. And want info on which grade to use
That's a good point, but there is also this thing called an "owner's manual." Lot's of good info. in there! smile
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#2698479 - 07/28/12 10:44 PM Re: Oil for 2005 Impala w/ 3.8 Series II [Re: oldmaninsc]
Garak Offline


Registered: 12/05/09
Posts: 10951
Loc: Regina, Saskatchewan, Canada
And there aren't a lot of three year old SM/GF-4 oils left on the shelf, either. What was valid three years ago isn't necessarily current now.
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Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Hastings LF113
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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