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Chevy 5.7 and cleaning #4634874
01/14/18 05:52 PM
01/14/18 05:52 PM
Joined: May 2003
Posts: 553
USA
lght1 Offline OP
lght1  Offline OP

Joined: May 2003
Posts: 553
USA
Hi

I havent posted here in ages but thought I'd post a cleaning question for my old school Chevy Vortec 5.7. Last fall I finally found a nice old body style Chevy Tahoe 2dr that was a southern rust free truck.

After acquiring it, we recently did the MPFI upgrade and while having the upper intake off the truck, noticed how dirty the top of the lower intake was.

The engine seems to be a replacement as the odometer shows 198,000 miles yet goes over 3000 miles on a quart of Penz 5w-30 synthetic.

To gently clean this engine, rather than run a "cleaner" through it, when spring arrives, I think I will try running 15-40 Rotella through the engine.

Any thoughts of this?

Thanks

Re: Chevy 5.7 and cleaning [Re: lght1] #4634885
01/14/18 06:07 PM
01/14/18 06:07 PM
Joined: Jun 2017
Posts: 133
Tennessee
ChevyMan93 Offline
ChevyMan93  Offline

Joined: Jun 2017
Posts: 133
Tennessee
I dont have anything useful to add, but i thought id congratulate you on saying Vortec instead of vortex! People always say vortex and it drives me up a wall lol


2016 Chevrolet Silverado Z71 5.3
2017 Honda CR-V 2.4
Re: Chevy 5.7 and cleaning [Re: lght1] #4634897
01/14/18 06:16 PM
01/14/18 06:16 PM
Joined: May 2003
Posts: 553
USA
lght1 Offline OP
lght1  Offline OP

Joined: May 2003
Posts: 553
USA
Hi

Thanks grin

Re: Chevy 5.7 and cleaning [Re: lght1] #4634910
01/14/18 06:26 PM
01/14/18 06:26 PM
Joined: Feb 2013
Posts: 11,343
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline

Joined: Feb 2013
Posts: 11,343
Phoenix, AZ
Im not sure why youd think that consumption and mileage has anything to do with a replacement engine?

Id pop off a valve cover to see how dirty it is.

Personally, Id just keep using Pennzoil 5w30 for the cleaning and change it every 3,000 miles.


2015 Hyundai Sonata 2.4L 92k STP Synthetic HM 10w30 & Wix
2000 Toyota Camry 2.2L 233k Mobil Super HM 10w40 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: Chevy 5.7 and cleaning [Re: lght1] #4634935
01/14/18 06:48 PM
01/14/18 06:48 PM
Joined: May 2003
Posts: 553
USA
lght1 Offline OP
lght1  Offline OP

Joined: May 2003
Posts: 553
USA
Hi

The truck, if not the engine, has 200,000 miles. I have polled others with this engine /mileage combo and 3000 miles to a quart of synthetic is not typical, hence the replacement engine theory.

I am inclined to use HDEO, Rotella, for the cleaning on the lower intake. Possible a bad pcv was to blame at some point.

Re: Chevy 5.7 and cleaning [Re: lght1] #4634937
01/14/18 06:50 PM
01/14/18 06:50 PM
Joined: Oct 2008
Posts: 968
Iowa
Nyquist Offline
Nyquist  Offline

Joined: Oct 2008
Posts: 968
Iowa
Does it leak oil? That would be the first thing I would check as opposed to assuming the missing oil is due to consumption. All that takes is a gasket replacement to fix.


2015 Chevy Traverse 3.6L (LLT) Mobil 1 5w30 w/ Fram Ultra
2018 Chevy Cruze 1.4L (LE2) Mobil 1 5w30 w/ ACDelco
Re: Chevy 5.7 and cleaning [Re: lght1] #4634941
01/14/18 06:51 PM
01/14/18 06:51 PM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Congrats on a nice truck (the 2 dr. Tahoe has always caught my eye) with a darn good engine.

I think you have two misconceptions we need to dispel.
Oil consumption is not directly related to mileage, especially on an engine that is capable of over twice as many miles as yours has on it. It's possible it's been changed but engines treated properly can consume very little oil for much longer than that - you'll maintain your Vortec 350 wrong if you believe it's impossible for an engine to show almost no wear at 200K.
Secondly, Rotella 15w40 is a good oil but only a good choice in this engine if it's being worked to its limit in very hot weather or has low oil pressure. It's also not ideal for cleaning it up inside - thicker oils don't flush dirt away as well as thinner ones. A high mileage synthetic or blend will suit this engine very well - my dad has a '97 Suburban that has logged over 250,000 miles on Valvoline Maxlife 10w30 or 10w40... beginning at 170,000 when he got it. That engine has over 430K overhaul-free miles on it and consumption hasn't increased noticeably since he got it. I rest my case.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Chevy 5.7 and cleaning [Re: lght1] #4634973
01/14/18 07:18 PM
01/14/18 07:18 PM
Joined: May 2003
Posts: 553
USA
lght1 Offline OP
lght1  Offline OP

Joined: May 2003
Posts: 553
USA
Hi

Not sure why I would want to go to a blend for cleaning if I am already using Penz Plat 5w-30.

The Rotella is only for cleaning up the mess a sticky pcv may have left. Btw, this engine has metal backed lower intakes which the '97 orig engine were not built with. With the cleanliness of the external surface of the engine, I feel it was likely replaced.

When I got it in Oct, I replaced all rad hoses and flushed the Dex out and filled with G-05, a Hybrid OAT I have used for years.

I fluid filmed the truck before the snow came, so the nasty salt should have negligible opportunity to do its work.

Re: Chevy 5.7 and cleaning [Re: lght1] #4634979
01/14/18 07:26 PM
01/14/18 07:26 PM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Ah, sorry - I glanced up at Nick1994's reply to double check the type/weight and he didn't say synthetic. No, there's no compelling reason to move back to a syn blend from that oil. If there's other evidence it was replaced then it may have been, but that information wasn't in your original post. I still wouldn't use 15w40 to "clean up" an engine that will otherwise see 5- or 10w30.

Last edited by Alex_V; 01/14/18 07:27 PM.

To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Chevy 5.7 and cleaning [Re: lght1] #4634986
01/14/18 07:35 PM
01/14/18 07:35 PM
Joined: May 2003
Posts: 553
USA
lght1 Offline OP
lght1  Offline OP

Joined: May 2003
Posts: 553
USA
Quote:
"Does it leak oil? That would be the first thing I would check as opposed to assuming the missing oil is due to consumption. All that takes is a gasket replacement to fix."


No leaks. 3000 miles to a qt is very acceptable. :-) It appears this engine doesn't have a consumption problem.

I wanted to clean up the nasty mess caused likely by a $3.00 pcv a prior owner neglected.

Last edited by lght1; 01/14/18 07:41 PM.
Re: Chevy 5.7 and cleaning [Re: lght1] #4635013
01/14/18 07:56 PM
01/14/18 07:56 PM
Joined: Oct 2006
Posts: 1,900
Oshawa, Ont. Canada
irv Offline
irv  Offline

Joined: Oct 2006
Posts: 1,900
Oshawa, Ont. Canada
I'd stick to the PP or PUP 5W-30 if you want further cleaning. I don't know with a 100% certainty, but I don't think there's a better cleaning oil on the market, and according to Pennzoil, there isn't.


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Chevy 5.7 and cleaning [Re: lght1] #4635067
01/14/18 08:46 PM
01/14/18 08:46 PM
Joined: Sep 2015
Posts: 6,172
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,172
Kalifornia Kollective
The intake and heads may have been bolted to a new'ish short block, w/o cleaning ...

I'd run whatever you want for oil and toss a full can of BG109 in there 100 miles before every change. Drive that last 100 miles around town w/o revving the life out of it, and then do filter and oil smile

Due to the heat riser crossover in the manifold, they always back-on some crud to the underside. Perfectly normal smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Chevy 5.7 and cleaning [Re: lght1] #4635196
01/14/18 11:02 PM
01/14/18 11:02 PM
Joined: May 2003
Posts: 553
USA
lght1 Offline OP
lght1  Offline OP

Joined: May 2003
Posts: 553
USA
Hi

This one looked somewhat worse than what I saw on y-tube. Perhaps I will just keep going with the Penz Plat and change at 5000k.

Re: Chevy 5.7 and cleaning [Re: lght1] #4635244
01/15/18 12:02 AM
01/15/18 12:02 AM
Joined: Mar 2003
Posts: 3,530
Colorado
Chris B. Offline
Chris B.  Offline

Joined: Mar 2003
Posts: 3,530
Colorado
I have a 1997 GMC Sierra with the 5.7 Vortec. It only has 85,000 miles and only sees 1,000 milers per year and sits in the garage most of the time. I change the oil(Castrol GTX 5w30)once per year or 1,000 miles and it burns zero oil in that OCI.

Re: Chevy 5.7 and cleaning [Re: lght1] #4635254
01/15/18 12:19 AM
01/15/18 12:19 AM
Joined: Dec 2016
Posts: 8,011
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,011
Waco, TX
My 1995 K3500 (7.4 liter, not 5.7) has 284,000 and uses 1 quart in 2500-3000 driven lightly
(if its being worked hard, it'll use a quart in 1800-2000 or so) - Original engine, never rebuilt

15W-40 most all it's life..
usually TSC Traveler or Cenex(Land o' lakes) 15W-40,
sometimes SuperTech from walmart.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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