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16 y/o car w/98k, switch oil? #5135513
06/16/19 08:13 AM
06/16/19 08:13 AM
Joined: Jun 2019
Posts: 5
Deep South USA
Ricky_Samsonia Offline OP
Ricky_Samsonia  Offline OP

Joined: Jun 2019
Posts: 5
Deep South USA
Got my mom's 2003 buick park ave 3.8 base. It has 98k and always dealer serviced with acdelco 5w30 syn-blend. It has no leaks, no smoke.Would it be ok to switch "cold turkey" to M1 10-30 syn HM or does it have too many miles?Or would it work out better to gradually switch to Full-Syn-HM like first change the oil with 3.5 qts of 10-30 Syn-Blend & 1 qt M1 10-30 Syn HM? The oil capacity is 4.5 qts. This is such a good/nice car, I simply don't want to start any crap with this gd engine but on the other hand I would love to get 300k mi with this nice full-size car. 

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135517
06/16/19 08:16 AM
06/16/19 08:16 AM
Joined: Jun 2003
Posts: 34,650
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,650
ME
Do what you want. You don't have to "train" it on the new oil.

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135525
06/16/19 08:29 AM
06/16/19 08:29 AM
Joined: Oct 2004
Posts: 9,136
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline

Joined: Oct 2004
Posts: 9,136
Cincinnati, OH, USA
If it's not broken, I wouldn't change it! The 3.8 might be one of the toughest engines GM ever made-I would put more effort into maintaining the transaxle/transmission and Dexcool cooling system if it was mine. You're not in the Rust Belt-it might last the rest of your life!


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135535
06/16/19 08:37 AM
06/16/19 08:37 AM
Joined: Dec 2005
Posts: 1,000
Ontario Canada
caprice_2nv Offline
caprice_2nv  Offline

Joined: Dec 2005
Posts: 1,000
Ontario Canada
This is an engine that's good with extended oci if there ever was one. I've seen one go 50k miles on a conventional bulk oil, just topped up until the oil filter rusted through. It was a taxi, 05 Impala with 200k in it. I drove it for a bit when I tried taxi driving as a second job for a few months. It ran great. Only issue it had with the engine was a starter and a harmonic balancer. It rusted out in the back because of a water leak and got retired early.

You can use whatever oil you want but if you use a full synthetic you can go longer between oil changes and high mileage isn't a bad idea because leaks are likely at this age.


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135545
06/16/19 08:47 AM
06/16/19 08:47 AM
Joined: Aug 2010
Posts: 6,550
Champlain/Hudson Valley
Kira Offline
Kira  Offline

Joined: Aug 2010
Posts: 6,550
Champlain/Hudson Valley
Just my 2¢:

As groovy as synthetics are if there's no compelling reason to use a synthetic such as a finicky PCV system or extra hot zones (oil pan near a turbo unit) I'd stick with good mineral based oil at "normal" change intervals.

This is because I'm a fan of "out with the old" regarding engine dirt.

If monitoring your oil is a source of fun then have at IT ALL. Extending oil changes, seeking the best filters etc.

Do remember, switching to synthetics does have that break in period where the car will use some oil. This has been my experience. Someone will be along shortly to state I am nuts....which is completely beside the point.

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135553
06/16/19 08:54 AM
06/16/19 08:54 AM
Joined: Dec 2006
Posts: 20,002
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline

Joined: Dec 2006
Posts: 20,002
Dallas,Tx USA
All the GM 3.8's we had LOVED Pennzoil products. Ran the smoothest on them. If I'd known more about Quaker State back then that's what I would've used. Since it's already had a partial synth oil,I'd go full synth. QSUD 10W30 with an AC Delco filter would be my choice.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 10W30

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135562
06/16/19 09:02 AM
06/16/19 09:02 AM
Joined: Aug 2016
Posts: 453
Alberta
carviewsonic Offline
carviewsonic  Offline

Joined: Aug 2016
Posts: 453
Alberta
I have an '03 Park Ave with 187000 miles. Ran on M1 5-30 at 6000 mile intervals most of it's life, with a lot of cold weather short tripping. Engine runs great, doesn't use oil. But the trans is not doing so well. So, I could have gone with 10000 mile changes, or cheaper conventional oil, would have made no difference to the life of the car. Buy a trans pan with a drain bolt, and do frequent drain and fills.


'18 Impala
'05 Park Avenue
'03 Park Avenue
'07 Honda Accord
'09 VStar 1300
Re: 16 y/o car w/98k, switch oil? [Re: aquariuscsm] #5135563
06/16/19 09:03 AM
06/16/19 09:03 AM
Joined: Jun 2019
Posts: 5
Deep South USA
Ricky_Samsonia Offline OP
Ricky_Samsonia  Offline OP

Joined: Jun 2019
Posts: 5
Deep South USA
Thank you!

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135567
06/16/19 09:12 AM
06/16/19 09:12 AM
Joined: Oct 2014
Posts: 645
On the road Midwest
Ihatetochangeoil Offline
Ihatetochangeoil  Offline

Joined: Oct 2014
Posts: 645
On the road Midwest
What elefino said. And you can buy a Transmission pan with a drain plug here: https://zzperformance.com/collections/3800/Transmission-&-drivetrain#productOutput I change my Trans. fluid ~30-50K intervals. A shifft kit will abolish the 2nd-3rd gear sluggishness.

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135570
06/16/19 09:17 AM
06/16/19 09:17 AM
Joined: Sep 2018
Posts: 359
Raleigh NC
MrMoody Offline
MrMoody  Offline

Joined: Sep 2018
Posts: 359
Raleigh NC
Take my advice from a high mile 3800 owner: if it doesn't leak oil, don't put HM oil in it. Scoffers gonna scoff but don't do it. There's nothing magic about the stuff for high mile engines other than the seal "conditioner." Regular M1 10W30 is perfect.

As said, the trans is the bigger worry. It needs fluid changed every 30K. If it's neglected, it will start being sluggish, banging and slipping. And if it has the plastic coolant elbows at the belt tensioner, they will crack and leak if they haven't already. Replace with metal ones.


2018 Hyundai Kona 1.6T DCT
2006 Pontiac (Holden) GTO AT
2001 Pontiac Grand Prix GT 3.8 NA (beater)
2005 Toyota Matrix FWD (ultra beater)
"Fob" and "Noack" are not acronyms.
Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135620
06/16/19 10:37 AM
06/16/19 10:37 AM
Joined: Feb 2014
Posts: 3,188
Yellowbrick Rd(KS)SemiRetired
Marco620 Offline
Marco620  Offline

Joined: Feb 2014
Posts: 3,188
Yellowbrick Rd(KS)SemiRetired
Just go with Quaker Statd HM or Maxlife and be done. The interior and transmission are gonna be your biggest worry.


15' Civic 1.8 i-vtec 254,000 mi Redline 5/0w20, BP transmax cvt fluid & Archoil9100
Tornado Chaser Extraordinar!
Son of a Navy Corpsman. Support vets!


Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135669
06/16/19 11:40 AM
06/16/19 11:40 AM
Joined: Dec 2016
Posts: 9,119
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 9,119
Waco, TX
Originally Posted by Ricky_Samsonia
Got my mom's 2003 buick park ave 3.8 base. It has 98k and always dealer serviced  


Am I experiencing Deja Vu here?


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135678
06/16/19 11:54 AM
06/16/19 11:54 AM
Joined: Sep 2005
Posts: 6,474
MIchigan
Warstud Offline
Warstud  Offline

Joined: Sep 2005
Posts: 6,474
MIchigan
This should be in the " Passenger Car Motor Oil (PCMO) - Gasoline Vehicles Forum"

Re: 16 y/o car w/98k, switch oil? [Re: Ricky_Samsonia] #5135681
06/16/19 11:59 AM
06/16/19 11:59 AM
Joined: Dec 2006
Posts: 20,002
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline

Joined: Dec 2006
Posts: 20,002
Dallas,Tx USA
My dad's 1990 Olds Delta 88 had almost 600,000 miles on it before he gave it away when he got a new vehicle. All on PYB 10W30 every 3000 miles. The exterior looked like an almost 600K car but the interior still was mint. It went to around 450K on the original transmission.

Back when my gf had a 1998 Olds 88,I tried M1 10W30 in it,and it ran rough and noisy,especially at startup. That's the first time I ever in my life heard a GM 3.8 tick upon startup. Went back to PYB and it was smooth and silent again.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 10W30

Re: 16 y/o car w/98k, switch oil? [Re: aquariuscsm] #5135693
06/16/19 12:30 PM
06/16/19 12:30 PM
Joined: Aug 2008
Posts: 2,561
Cali
Malo83 Offline
Malo83  Offline

Joined: Aug 2008
Posts: 2,561
Cali
If it ain't broke. cheers

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