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2006 buick lacrosse 3.8l #4629499
01/09/18 05:50 PM
01/09/18 05:50 PM
Joined: Oct 2015
Posts: 252
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP
Joined: Oct 2015
Posts: 252
Washington
Grandparents buick just hit 75k. Im the one that maintenances the car. What should i do for the 75k? Plugs, wires, belt inspection, tranny drain fill, anything else? Has oem plugs and wires. I already did a comple tranny fluid flush/ change at 50k at work. Anything im missing for 75k. Just did new douglas all seasons in december with a alignment.

Last edited by Dylan1303; 01/09/18 05:51 PM. Reason: Spelling errors

12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629506
01/09/18 05:56 PM
01/09/18 05:56 PM
Joined: May 2010
Posts: 419
Pittsburgh PA USA
Milkman Offline
Milkman  Offline
Joined: May 2010
Posts: 419
Pittsburgh PA USA
Unless there is a problem, the plugs should be good to 100K. Check the belt carefully. The hoses should be good indefinatly. GM used quality hoses.


2018 Dodge Charger R/T 5.7 Hemi (Mine)
2010 Chevrolet Malibu LT (Hers)

Good cars...

Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629507
01/09/18 05:57 PM
01/09/18 05:57 PM
Joined: Nov 2015
Posts: 25
AZ
FFFEMT Offline
FFFEMT  Offline
Joined: Nov 2015
Posts: 25
AZ
Brake fluid change, and timing belt and related items.

Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629514
01/09/18 06:02 PM
01/09/18 06:02 PM
Joined: Mar 2008
Posts: 5,943
Michigan
ZZman Offline
ZZman  Offline
Joined: Mar 2008
Posts: 5,943
Michigan
Serpentine belt, struts, ps full, brake flush


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: 2006 buick lacrosse 3.8l [Re: FFFEMT] #4629518
01/09/18 06:04 PM
01/09/18 06:04 PM
Joined: Jan 2008
Posts: 10,671
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,671
OH
Brake fluid, coolant drain and fill, ATF d&f, PS fluid, clean and lube battery terminals, clean and lube brake calipers, wipers

New air and cabin filters

Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629570
01/09/18 07:01 PM
01/09/18 07:01 PM
Joined: Feb 2013
Posts: 10,699
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 10,699
Phoenix, AZ
Do the coolant with new Dexcool.

Have the intake manifold gaskets been done yet?


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629582
01/09/18 07:12 PM
01/09/18 07:12 PM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline
Hemispheres  Offline
Joined: Jan 2017
Posts: 420
Virginia
Coolant flush. Do it at the dealer or you'll never get all the old stuff out. Intake gaskets don't need to be changed on the newer 3.8's. Aluminum upper intake manifold along with the steel crush gaskets on the lower intake.

Honestly if it's only got 75k on it I'd go ahead an run CRC 5 minute engine flush to remove any sludge. Make sure the engine is operating temp before adding it, lowers the chance of dislodging a giant glob of sludge. Other than that the trans is decent, I'd drop it anyways to replace the filter, replaced with 7.2 qts of Dex VI and call it done.

Plugs and wires should be good. Changed mine at 98k just because of manufacturer recommendations and didn'd notice any increase in mileage, engine ran just the same too.


2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629590
01/09/18 07:18 PM
01/09/18 07:18 PM
Joined: Oct 2015
Posts: 252
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP
Joined: Oct 2015
Posts: 252
Washington
Sounds like just brake, ps, and coolant. Will check the cabin air also. Air filter was done about 2 oil changes ago so its fine. I have them do quaker state con with ac delco oil filter at walmart. Every 3-4k they live 30 miles from town so it doesnt really get short tripped.

Last edited by Dylan1303; 01/09/18 07:19 PM.

12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629642
01/09/18 07:53 PM
01/09/18 07:53 PM
Joined: Jun 2008
Posts: 267
Minnesota
bmod305 Offline
bmod305  Offline
Joined: Jun 2008
Posts: 267
Minnesota
Coolant elbows!!! PCV

Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629709
01/09/18 08:34 PM
01/09/18 08:34 PM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Coolant flush if it looks like it could use it. Bleed the brakes and flush out the old fluid. Maybe check/clean the throttle body. Inspect belts and hoses but they do last quite a while so no need to shotgun all that, or the ignition stuff. (FYI when the time - 100K - comes for plugs, I've burned up a set of Delco coppers in ~1000 miles but Delco iridiums run very well.) Don't worry about the transmission until 100K, either. PS flush is optional but not a bad idea.

Last edited by Alex_V; 01/09/18 08:38 PM.

I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: 2006 buick lacrosse 3.8l [Re: Alex_V] #4629725
01/09/18 08:43 PM
01/09/18 08:43 PM
Joined: Oct 2012
Posts: 307
North Carolina
Egg_Head Online content
Egg_Head  Online Content
Joined: Oct 2012
Posts: 307
North Carolina
Cabin filter. When you replace the plugs buy new wires b/c you'll screw them up getting them off the OE plugs.

Last edited by Egg_Head; 01/09/18 08:51 PM.

1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)
Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629792
01/09/18 09:44 PM
01/09/18 09:44 PM
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
The main drive pulley for the serpentine belt is a combination pulley and harmonic balancer. They go bad around 75K to 85K miles. There is a black rubber piece between the inner pulley and the outer drive pulley. That black rubber breaks down with age and the outer pulley becomes un-aligned and that causes the serpentine belt to fall off of the drive pulley. When that happens the vehicle looses power-steering, alternator, and water-pump. Even if the person driving it has the mussel to man-handle the steering-wheel without the assist of the power, the engine will quickly over-heat without the water-pump working. And if someone does put a new serpentine belt on it will quickly fall off, until a new balancer/pulley is put on.

Note, to access the balance/pulley remove the front wheel and the wheel-well.

----------------------------------------------------------------------------------------------------------------------------------


Also to flush the power-steering fluid with new fluid, get some type of siphon and two large bottles of power-steering fluid, and a container to put used fluid into.

Siphon out the power-steering fluid, replace with new fluid, start the engine and turn the steering wheel all the way to one side, and then all the way to the other side and then back to center, shut off the engine, and repeat until you use up all of the two big bottles of fluid.

Last edited by JimPghPA; 01/09/18 09:48 PM.

Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: 2006 buick lacrosse 3.8l [Re: JimPghPA] #4629920
01/10/18 01:03 AM
01/10/18 01:03 AM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline
Hemispheres  Offline
Joined: Jan 2017
Posts: 420
Virginia
Originally Posted By: JimPghPA
The main drive pulley for the serpentine belt is a combination pulley and harmonic balancer. They go bad around 75K to 85K miles. There is a black rubber piece between the inner pulley and the outer drive pulley. That black rubber breaks down with age and the outer pulley becomes un-aligned and that causes the serpentine belt to fall off of the drive pulley. When that happens the vehicle looses power-steering, alternator, and water-pump. Even if the person driving it has the mussel to man-handle the steering-wheel without the assist of the power, the engine will quickly over-heat without the water-pump working. And if someone does put a new serpentine belt on it will quickly fall off, until a new balancer/pulley is put on.

Note, to access the balance/pulley remove the front wheel and the wheel-well.

Also to flush the power-steering fluid with new fluid, get some type of siphon and two large bottles of power-steering fluid, and a container to put used fluid into.

Siphon out the power-steering fluid, replace with new fluid, start the engine and turn the steering wheel all the way to one side, and then all the way to the other side and then back to center, shut off the engine, and repeat until you use up all of the two big bottles of fluid.


----------------------------------------------------------------------------------------------------------------------------------

Yeah mine went bad at around 100k miles. They actually have a plastic access panel to get to the balancer, you don't have to pull the wheel well as you can swivel the access panel out of the way. Given the pain in the [censored] it is to get everything lined up and pull the balancer without damaging the CPS sensor (don't screw the puller bolts all the way in or the magnetic pull will screw up the sensor and cause a no start condition)I'd wait until it went bad to replace. My 3800 saw a lot of high RPM operation between 75k and the failure of the balancer which most likely contributed to it falling apart. I still drove it 60 miles back home without it damaging anything. Made a god awful racket tho. I remember sitting at a drive thru and hearing the bang bang bang of the balancer and thinking that couldn't be me. Moved the gear selector around and I was like oh [censored] my car is DONE!


Last edited by Hemispheres; 01/10/18 01:05 AM.

2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4629978
01/10/18 06:18 AM
01/10/18 06:18 AM
Joined: Nov 2014
Posts: 88
PA
GON Offline
GON  Offline
Joined: Nov 2014
Posts: 88
PA
The GM 3.8L is a awesome engine. Very good on fuel economy, super reliable, can easy go 300k with just oil changes, spark plugs, and plug wires. A coil may go occasionally but super easy to replace.

Only issue(s) with the engine are intake manifold gaskets and coolant elbows.

Re: 2006 buick lacrosse 3.8l [Re: Dylan1303] #4630093
01/10/18 09:18 AM
01/10/18 09:18 AM
Joined: Sep 2015
Posts: 1,526
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,526
USA
The series III engine has a metal upper intake and upgraded gaskets that are generally trouble free. You should pre-emptively replace the elbows when changing the coolant though.

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