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#3322911 - 03/25/14 10:24 AM Re: Advantages of straight weight oil [Re: Now]
dlundblad Online   happy


Registered: 09/30/13
Posts: 7353
Loc: Midwest
In the summer heat at least, I wonder if it would be beneficial to buy PYB HD 30 weight to use as that 6th quart or as a top off oil.

Didnt AZ have some on clearance for $5 per 5 qt jug??
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#3323431 - 03/25/14 05:47 PM Re: Advantages of straight weight oil [Re: KCJeep]
Red91 Online   content


Registered: 12/09/13
Posts: 1222
Loc: Alabama, United States
I'm looking at Delo SAE30 from my local NAPA. I'd be running it in a '91 GMC Sierra with a TBI 5.7. Probably all seasons due to the fact that it's a second vehicle/beater, and it will probably not even see 500 miles a year any longer. I'm sticking with 5W-30 in the Dakota.
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#3323784 - 03/26/14 12:24 AM Re: Advantages of straight weight oil [Re: Now]
friendly_jacek Offline


Registered: 05/04/03
Posts: 6451
Loc: southeast US
When a boating store went out of business several years ago, they had a huge clearance on marine 15W40 and 40 oils (under a buck per qt). They look like repackaged HDEO. Not being sure which is better for my boat, I typically blend them and this comes closer to the 25W40 Mercruiser specifies for the engine, LOL.

However, one time I used straight 40 only and it was a pain to drain the cold oil during late fall. The oil was ridiculously thick in ambient temps.

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#3323813 - 03/26/14 03:32 AM Re: Advantages of straight weight oil [Re: dlundblad]
Shannow Offline


Registered: 12/12/02
Posts: 34424
Loc: Oz
Originally Posted By: dlundblad
In the summer heat at least, I wonder if it would be beneficial to buy PYB HD 30 weight to use as that 6th quart or as a top off oil.

Didnt AZ have some on clearance for $5 per 5 qt jug??


PYB SAE30 used to be available down here, and had become a significant part of my normal purchasing, using it in my BJ42, and J-Car wagon (before I used 25W-70 in it one winter to demonstrate that it wouldn't blow it up). The PYB had up to date "S" specs.

Alas, the only generally SAE30s that are typically available are Delvac 1330, which I tend not to use (would be all over 1630), and various lawnmower oils, which I resorted to with my E30, running a fill of Caltex mower oil (Delo 500 at the time).

Note, that in every case, the 30 was thinner at 100C than the recommended for my vehicle in the manual...but was relying on hths, not KV100.

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#3323866 - 03/26/14 07:01 AM Re: Advantages of straight weight oil [Re: Shannow]
supercity Offline


Registered: 06/12/12
Posts: 1070
Loc: Australia
Originally Posted By: Shannow



Alas, the only generally SAE30s that are typically available are Delvac 1330, which I tend not to use (would be all over 1630), and various lawnmower oils,


RX Mono 30 should be easy enough to get. It's sold in 5L jugs

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#3323931 - 03/26/14 08:05 AM Re: Advantages of straight weight oil [Re: supercity]
Ducked Online   content


Registered: 10/25/12
Posts: 1633
Loc: Taiwan
I read an article online a while ago that suggested straight weight oil offered better corrosion protection to light aircraft engines (which sit idle for long periods) because it was retained on the parts better.

Failure rates were allegedly higher with multigrades.

Since my car sits idle for long periods, that'd be a reason to use it. Its got a mixture of CPC straight 40 and Delvac 15/40 in it at the moment, but summer is just around the corner.

Can't find the article now, unfortunately.

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#3323947 - 03/26/14 08:17 AM Re: Advantages of straight weight oil [Re: Now]
Zaedock Offline


Registered: 09/10/05
Posts: 3902
Loc: Massachusetts
I ran the Delo SAE30 because I bought a butt load of it for $.99/gallon. If that deal didn't exist, I wouldn't purposely go out and buy a SAE30 when 5W30 is typically the same price and offers superior performance in most cases.
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#3323955 - 03/26/14 08:25 AM Re: Advantages of straight weight oil [Re: Ducked]
Zaedock Offline


Registered: 09/10/05
Posts: 3902
Loc: Massachusetts
Originally Posted By: Ducked
Since my car sits idle for long periods, that'd be a reason to use it.


Not really. I doubt you run an air cooled, opposed, dry sump engine that burns leaded av gas.

My vehicles sit for extended periods outside and 5W30 has more than been up to the task, especially if your interval extends into the winter months.
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#3323958 - 03/26/14 08:26 AM Re: Advantages of straight weight oil [Re: Now]
Ducked Online   content


Registered: 10/25/12
Posts: 1633
Loc: Taiwan

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#3323961 - 03/26/14 08:34 AM Re: Advantages of straight weight oil [Re: Zaedock]
Ducked Online   content


Registered: 10/25/12
Posts: 1633
Loc: Taiwan
I'm in Taiwan, but I have heard of these "winter months" of which you speak.

Re "5W30 has been more than up to the task" I could say straight 40 was more than up to the task in my Sierra, but you wouldn't know what, if anything, that meant, either.

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#3323990 - 03/26/14 08:56 AM Re: Advantages of straight weight oil [Re: Now]
Zaedock Offline


Registered: 09/10/05
Posts: 3902
Loc: Massachusetts
While SAE40 is up to the task, there is no reason to use a lubricant that thick in your location.
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#3324063 - 03/26/14 10:33 AM Re: Advantages of straight weight oil [Re: Now]
KCJeep Offline


Registered: 06/30/11
Posts: 6484
Loc: Mahzurrah!
Well PYB HD30 is available here at a bunch of locations, but I have yet to find a jug to keep the costs down. Napa does have it "on sale" for $3.59 a quart though I'd like to do better. Rotella SAE30 is available at Tractor Supply in jugs but I want to run PYB, it has been my favorite lube in the Jeep thus far.

I will look at Autozone.
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#3324126 - 03/26/14 11:42 AM Re: Advantages of straight weight oil [Re: Now]
KCJeep Offline


Registered: 06/30/11
Posts: 6484
Loc: Mahzurrah!
Okay here's a related question. Why is the TBN on PYB HD30 about 7 when the TBN on PYB 5w30 is almost 10? According to Pennzoil the HD30 still has detergents and anti wear additives, it even has the "removes up to 40% of sludge on the first change" advertising stuff on it.
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2004 Jeep Grand Cherokee 4.0 @ 137k
Castrol Edge 0w40 w/ 1 qt 0w20 - Fram TG16
KIA Sedona 66k, Ford Focus 119k, Chrysler Concorde 120k, Mazda 6 113k

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#3324236 - 03/26/14 01:28 PM Re: Advantages of straight weight oil [Re: Now]
Zaedock Offline


Registered: 09/10/05
Posts: 3902
Loc: Massachusetts
Not sure why TBN is lower compared to it's multi-weight counterpart.

The Delo SAE30 TBN from '05 is 10.1.
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#3324242 - 03/26/14 01:31 PM Re: Advantages of straight weight oil [Re: dlundblad]
gfh77665 Offline


Registered: 09/01/08
Posts: 3194
Loc: Southeast Texas
Originally Posted By: dlundblad
In the summer heat at least, I wonder if it would be beneficial to buy PYB HD 30 weight to use as that 6th quart or as a top off oil.


I have done that for years. I always felt it would combat the shearing that naturally occurs.

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