Recent Topics
Mobil Super or Mobil 1
by 80Boxcar - 08/21/19 07:34 PM
17 Accord 6AT "service"
by Schmoe - 08/21/19 07:26 PM
Caliper Recommendations for 2002 Tacoma
by madibob - 08/21/19 07:14 PM
KoruWorks code
by GumbyJarvis - 08/21/19 06:34 PM
Differential / Axle VENT
by MasterSolenoid - 08/21/19 06:14 PM
Oil for Volvo S60 T6 R-Design
by Luke352 - 08/21/19 05:52 PM
Motorcraft 5w30 synthetic blend SN+
by mpgo4th - 08/21/19 05:37 PM
6.7 powerstroke cab off repair work
by mattd - 08/21/19 04:23 PM
talk to me about security cameras
by 1978elcamino - 08/21/19 03:30 PM
modem in 1 room want phone in another room
by raaizin - 08/21/19 02:17 PM
AC Belt Question
by BISCUT - 08/21/19 02:10 PM
Pros and cons of Electronic Parking Brakes?
by KGMtech - 08/21/19 01:50 PM
Got my first BS sample kit - now what?
by ARCOgraphite - 08/21/19 01:00 PM
2016 Mazda6: no belt replacement interval
by Elkins45 - 08/21/19 01:00 PM
Replaced alternator but kept belt
by Deontologist - 08/21/19 12:51 PM
NapaGold 1348 c&p, 7+yr.OPE fci.
by Sayjac - 08/21/19 12:38 PM
Toyo Proxes ST3
by Redright9 - 08/21/19 12:20 PM
Do you trust air filling stations?
by walterjay - 08/21/19 12:10 PM
Newest Members
yote556, JimJersey, Sissen, Luke352, drh214
69021 Registered Users
Who's Online Now
110 registered members (2015_PSD, 53' Stude, 80Boxcar, 25ring, 01rangerxl, 9 invisible), 2,119 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics293,621
Posts5,043,603
Members69,021
Most Online3,532
Jul 30th, 2019
Donate to BITOG
Print Thread
Hop To
Page 1 of 2 1 2
Lucas 20W50 - good for my low oil pressure GM 350? #4101334 05/19/16 08:12 PM
Joined: Dec 2009
Posts: 285
S
sr17 Offline OP
OP Offline
S
Joined: Dec 2009
Posts: 285
I have a 1991 GMC Sierra K2500 that suffers from low oil pressure to the point that the "check gauges" light flickers on when the engine is hot and A/C is running.
The engine is otherwise running very smoothly, pulls strongly and never makes any bad noises. Oil burn is moderate less than 1 qt per 2,500 miles.

I have another thread to discuss diagnostic and repair, but this thread is mainly to seek feedback on oil.

I am going to try a 20W50 to see what it does for oil pressure readings. The local parts store has a pretty good price on Lucas Oil 20W50. Is it any good, or shoul I stay away from it?


2005 VW Jetta TDI - 222,000 km, M1 TDT
2000 VW Golf TDI - 354,000 km, Shell T6
1991 GMC Sierra 2500 5.7L 4 WD
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101342 05/19/16 08:22 PM
Joined: Dec 2010
Posts: 2,008
A
abycat Offline
Offline
A
Joined: Dec 2010
Posts: 2,008
If you have bad pressure then you have bad flow. a 20w50 would limit the flow even more. I would get a quote for a new pump installed. You might say [censored] it and put a new pump in.


2017 dodge caravan gt
2011 nissan versa hb
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: abycat] #4101346 05/19/16 08:27 PM
Joined: Dec 2009
Posts: 285
S
sr17 Offline OP
OP Offline
S
Joined: Dec 2009
Posts: 285
Originally Posted By: abycat
If you have bad pressure then you have bad flow. a 20w50 would limit the flow even more. I would get a quote for a new pump installed. You might say [censored] it and put a new pump in.


I have learned from numerous sources that changing the pump is unlikely to make a significant difference - the pump creates flow, but not pressure, which is more dependent on wear tolerances inside the engine.

In this thread I am mainly hoping to get some good feedback on Lucas 20W50.


2005 VW Jetta TDI - 222,000 km, M1 TDT
2000 VW Golf TDI - 354,000 km, Shell T6
1991 GMC Sierra 2500 5.7L 4 WD
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101353 05/19/16 08:36 PM
Joined: Jun 2003
Posts: 2,881
U
userfriendly Offline
Offline
U
Joined: Jun 2003
Posts: 2,881
Lucas is good for chainsaw bar oil.
What else do you need to now about it?

You can buy a pail of 15W40 CJ-4 at Canuck Tire for $59 which is as good as it gets for very little money.

Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101354 05/19/16 08:37 PM
Joined: Jun 2015
Posts: 733
R
Run Offline
Offline
R
Joined: Jun 2015
Posts: 733
Stick to a 5 or 10w-30 oil.


09 Hyundai Tucson 2.0 5spd
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101364 05/19/16 08:45 PM
Joined: Aug 2011
Posts: 2,096
GumbyJarvis Online Happy
Online Happy
Joined: Aug 2011
Posts: 2,096
Rotella SAE 30? Defy 10w40?
I was stationed with a buddy who had a 315CI, He ran Berrymans mixed in with Rotella sae30 for 500 miles on his mid eighties chevy truck, ran a can in the oil and a can in the gas tank, afterwards he switched to QSGB 10w40, his Oil pressure went back to normal after the "clean up"

Last edited by GumbyJarvis; 05/19/16 08:51 PM.

2018 RAM 1500 SLT 5.7L HEMI 19K
Schaeffers 5w20 - Mahle OC 614

Disabled US Army Vet
OEF 2013-2014

Stash:
Filters- 11
Quarts- 45
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: GumbyJarvis] #4101368 05/19/16 08:52 PM
Joined: Aug 2011
Posts: 2,096
GumbyJarvis Online Happy
Online Happy
Joined: Aug 2011
Posts: 2,096
Originally Posted By: GumbyJarvis
Rotella SAE 30? Defy 10w40?
I was stationed with a buddy who had a 315CI, He ran Berrymans mixed in with Rotella sae30 for 500 miles on his mid eighties chevy truck, ran a can in the oil and a can in the gas tank, afterwards he switched to QSGB 10w40, his Oil pressure went back to normal after the "clean up"


This was paired with a Napa Proselect filter.


2018 RAM 1500 SLT 5.7L HEMI 19K
Schaeffers 5w20 - Mahle OC 614

Disabled US Army Vet
OEF 2013-2014

Stash:
Filters- 11
Quarts- 45
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101369 05/19/16 08:52 PM
Joined: Dec 2009
Posts: 285
S
sr17 Offline OP
OP Offline
S
Joined: Dec 2009
Posts: 285
Hmmmmm, no love for Lucas, Eh?
I have set my mind on trying a 20W50, was hoping Lucas was good since it is inexpensive but I suppose it was not to be.


2005 VW Jetta TDI - 222,000 km, M1 TDT
2000 VW Golf TDI - 354,000 km, Shell T6
1991 GMC Sierra 2500 5.7L 4 WD
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101373 05/19/16 08:56 PM
Joined: Jun 2003
Posts: 19,367
C
Chris142 Online Content
Online Content
C
Joined: Jun 2003
Posts: 19,367
Have you actually checked the pressure with a real gauge?


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101374 05/19/16 08:57 PM
Joined: Jun 2015
Posts: 733
R
Run Offline
Offline
R
Joined: Jun 2015
Posts: 733
Define inexpensive? It must be old slow moving stock, wouldn't matter in this engine.


09 Hyundai Tucson 2.0 5spd
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: Chris142] #4101375 05/19/16 08:57 PM
Joined: Dec 2010
Posts: 2,008
A
abycat Offline
Offline
A
Joined: Dec 2010
Posts: 2,008
Originally Posted By: Chris142
Have you actually checked the pressure with a real gauge?


I assumed that was done but yeah that's a great idea.


2017 dodge caravan gt
2011 nissan versa hb
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101380 05/19/16 09:03 PM
Joined: Dec 2010
Posts: 2,008
A
abycat Offline
Offline
A
Joined: Dec 2010
Posts: 2,008
an adjustable brand new oil pump is 52$ which would fix the pressure and volume problem on the most worn engine and it's an hour to replace for the backyard mechanic. I just don't want to see you cause more problems with oil starvation. a new oil sender is under 20$ or even cheaper from a wrecking yard. hopefully you only have a bad sender and have great pressure.


2017 dodge caravan gt
2011 nissan versa hb
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101420 05/19/16 10:05 PM
Joined: Aug 2004
Posts: 1,324
J
JR Offline
Offline
J
Joined: Aug 2004
Posts: 1,324
Sounds like wear at the bearings. It time for a refreshing.
Climate permitted a heavy oil will help. Sae30/40, 20w-50, 15w-40, and alike.
Lucas is a choise, if priced the same as cheap dino. It is a bandaid for worn bearings.



Harvey


97 F250HD 7.3 320K 01 Astro 220K
93 metroXFi 94.5K
01 Impala 300K
04 RTV900R 1150hrs


Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101443 05/19/16 10:50 PM
Joined: Aug 2015
Posts: 1,115
F
Farmer Offline
Offline
F
Joined: Aug 2015
Posts: 1,115
Originally Posted By: sr17
Hmmmmm, no love for Lucas, Eh?
I have set my mind on trying a 20W50, was hoping Lucas was good since it is inexpensive but I suppose it was not to be.


Lucas isn't really that great, even their synthetic doesn't look good on paper.

Probably be better to pick up some HDEO. Inland Kenworth has 5 Gallon buckets of Delo 400 for $65. There should be one close by, Burnaby or Langley.

Last edited by Farmer; 05/19/16 10:51 PM.
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101470 05/19/16 11:31 PM
Joined: Aug 2007
Posts: 1,831
M
Michael_P Offline
Offline
M
Joined: Aug 2007
Posts: 1,831
As Chris142 asked; Have you actually checked the pressure with a real gauge?
Those GMT400 trucks with the small block notoriously had bad oil pressure sending units. I've replaced a bunch of those. A crowfoot makes the job easier. Given the year, make and model, I would first replace the oil pressure sending unit.

Page 1 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™