Motor Oil Brand vs Consumption?

NardDog · Apr 10, 2023

Just curious but I didn’t see what year the engine was but have you replaced the driver side valve cover, the original design clogged easily. Also I would second the idea of a catch can.

EddieC · Apr 10, 2023

swathdiver said:
If you find your local ACDelco dealer they may give you a good price on it. I've been buying it from Rock Auto for a few years now, last was $8.15 per quart delivered. Then when I thought my order was lost, I bought a couple cases from Summit Racing for $8.99 a quart delivered.

Plan B in case ACDelco got too hard to get or expensive was Shell Rotella Gas Truck but that appears to be gone now. So next down the list on viscosity was Quaker State. We're going to try it out on the next oil change and see if the motor rattles on start up like M1 used to do.

An interesting reference regarding oils listed as meeting various Dexos standards : https://www.gmdexos.com/index.html
It appears that Penzoil Platinum is supplied by Shell.

EddieC · Apr 15, 2023

swathdiver said:
View attachment 396414 View attachment 396415

The above was taken from: https://pqia.org/kirkland-signature-full-synthetic-sae-5w-30-motor-oil/

I know the numbers don't seem far off and I am far from a trained expert but my motor does not rattle like it used to with the ACDelco oil versus the plain Mobil One. We were going to try Quaker State next. Too bad Shell discontinued Gas Truck.

More importantly, how does your engine perform on it Tom? Oil consumption and cold start noise?

Where was the top chart from? Looking for more names on the reference.

swathdiver · Apr 15, 2023

EddieC said:
Where was the top chart from? Looking for more names on the reference.

My excel spreadsheet. Would get the data from their websites, PQIA.org and SDS Sheets.

EddieC · Apr 16, 2023

swathdiver,
What is your take on "high mileage" oils?

me88 · Apr 16, 2023

swathdiver said:
...The Mobil oil has lower viscosity numbers and my 3 motors don't like it.

Can also confirm, Mobil 1 5W30 makes the engine run noticeably noisier overall (incl. about 1sec. cold start chatter) compared to a different brand 5W30. What works well for me is using the ACDelco PF48E filter and any full synthetic 5W30 with dexos1 or dexos2 specification.

Dustin Jackson · Apr 16, 2023

I just did an oil change with Walmart brand full synthetic and a AcDelco PF63 filter.

Initial impressions are my idle oil pressure seems lower than normal by a hair but the pressure really goes up when accelerating.

swathdiver · Apr 16, 2023

EddieC said:
swathdiver,
What is your take on "high mileage" oils?

I've shied away from them. The Mobil One that I looked into was not Dexos rated and I didn't like the idea that the additives swelled up the seals, or that was my understanding of how they worked, right or wrong.

GranPrix · Apr 16, 2023

swathdiver said:
View attachment 396414 View attachment 396415

The above was taken from: https://pqia.org/kirkland-signature-full-synthetic-sae-5w-30-motor-oil/

I know the numbers don't seem far off and I am far from a trained expert but my motor does not rattle like it used to with the ACDelco oil versus the plain Mobil One. We were going to try Quaker State next. Too bad Shell discontinued Gas Truck.

More importantly, how does your engine perform on it Tom? Oil consumption and cold start noise?

Right when the Rotella announced they were no longer making it I must’ve gone to about 15 different auto stores and stocked up on jugs and quarts! They were like 75% off. Wife thought I was crazy but I haven’t paid for oil in two years!

EddieC · Apr 16, 2023

swathdiver said:
I've shied away from them. The Mobil One that I looked into was not Dexos rated and I didn't like the idea that the additives swelled up the seals, or that was my understanding of how they worked, right or wrong.

Quaker State High Mileage Full Synthetic is in the Dexos 1 Gen 3 list.
But then again, with what you wrote, makes me think ahead to what if a non-high mileage oil is used in the future after a high mileage oil and what if the seals reverse and shrink. Maybe over thinking it but then again GM isn't recommending high mileage oils for some reason. I guess that practice could be a source of dealer income though.

Motor Oil Brand vs Consumption?

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