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Lucas 20W50 - good for my low oil pressure GM 350? #4101334 05/19/16 07:12 PM
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sr17 Offline OP
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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 07:22 PM
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abycat Offline
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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 07:27 PM
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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 07:36 PM
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userfriendly Offline
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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 07:37 PM
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Stick to a 5 or 10w-30 oil.


02 Escape
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101364 05/19/16 07:45 PM
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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 07:51 PM.
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: GumbyJarvis] #4101368 05/19/16 07:52 PM
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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.

Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101369 05/19/16 07:52 PM
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sr17 Offline OP
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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 07:56 PM
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Have you actually checked the pressure with a real gauge?


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 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 07:57 PM
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Define inexpensive? It must be old slow moving stock, wouldn't matter in this engine.


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Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: Chris142] #4101375 05/19/16 07:57 PM
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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.


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2011 nissan versa hb
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101380 05/19/16 08:03 PM
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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 09:05 PM
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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 09:50 PM
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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 09:51 PM.
Re: Lucas 20W50 - good for my low oil pressure GM 350? [Re: sr17] #4101470 05/19/16 10:31 PM
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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.

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