Help choosing the proper oil for my next change

[78F350]

So, not being an expert on oil or engines I had to look up some info to understand the plain english of Markus's post.

HTHS
High Temperature, High Shear
https://www.motul.com/fr/en/community/373?
“Hot viscosity was measured until not very long ago only at 100°C, which is not very representative of the temperatures reached today by most recent engines. It was therefore decided to also measure viscosity at 150°C, and under a high shear rate, so as to really judge the capacity of the lubricant. That is what HTHS (High Temperature, High Shear) viscosity means.
The notion exists of High HTHS and Low HTHS: a Low HTHS oil has a lower viscosity at high temperature (<3.5 mPa.s) than that of a so-called High HTHS oil (>3.5 mPa.s). This notion is important as it allows the classification, on the one hand, of 'energy saving' oils having a low HTHS and, on the other hand, of high protection oils having a high HTHS.“
(I saw that Rotella T6 is 4.0, Mobil 1 0w-40 3.8)

High Temperature High Shear (HTHS) Bulletin | Driven Racing Oil
“Lower HTHS viscosity generally means a thinner oil which can improve fuel economy by reducing the amount of horsepower required to pump it throughout the engine. But a lower HTHS viscosity also usually comes at the expense of wear protection.“

Low SAPS
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2868824
SAPS stands for Sulphated Ash, Phosphorous, Sulphur.
Low SAPS basically will show up as lower sulphated ash level on a spec sheet. 1.36 would be full SAPS. 1 would be mid/lower SAPS.
“Lower levels of SAPS are desired in order to protect modern day emissions systems. The way lower SAPS is achieved is typically by reducing the additive levels in the oil.”
“The higher SAPS oils are actually longer lasting due to the higher initial TBN (acid neutralizing ability) of the engine oil. “
From what I have found so far, Rotella T6 is low SAPS, Mobil 1 0W-40 seems to have split this year to Full SAPS and Low SAPS
I'm still not clear on why avoiding this is important.

Mobil 1 product info sheet:
https://mobiloil.com/~/media/amer/us/pvl/files/pdfs/mobil-1-oil-product-specs-guide-2016.pdf
Rotella T6 info:
http://rotella.shell.com/products/t6-full-synthetic/_jcr_content/par/textimage_1335213348.stream/1388525673850/2c4570ceb0dcc96c0e045d7d6f3c7796f77a84ed6a3d6752bb 50d245468c48b2/rotella-t6-brochure.pdf

We need more oil threads.

[BoomerRoadie]

I said it before and I'll say it again...I love this forum!!

Several things....

Mark T. Yes I always use the Search feature to see what people have said before me. None of my posts have been "original material". But my questions are too specific in nature and I add constraints on you to find the best path. In this case I needed feedback specific to 5W40 and 5W50 type oils appropriate for the Phoenix area.

And Tommy583 is exactly correct...what fun is search when I can get your wisdom with a personal touch as Smallblock454 gave us. He was totally over my head and then 78F350 swooped in with a translation. Perfect!!

So, when it's all said and done, it took everyone's passionate suggestions including my mechanic's personal choice and ran the numbers using Amazon's prices converted to a per quart cost (see below). Out of this, Rottela T6 was the winner in happy users and lowest cost ($5.52 per quart). In my case I decided to stick with my mechanics suggestion and oil of choice and go with Total ($7.00 per quart). The crappy part is, when I ordered the oil, the three pack was not in stock. That's ok if I don't have to wait a long time for it. If I buy Total in a smaller quantity (5 qt) the cost jumps to $9.31 per quart. No thank you....I'll go with Rottela T6 in that case.

So...yet another oil thread has proved highly educational (and entertaining).

Thank you all!!!

[78F350]

Originally Posted by BoomerRoadie

... The crappy part is, when I ordered the oil, the three pack was not in stock. That's ok if I don't have to wait a long time for it. If I buy Total in a smaller quantity (5 qt) the cost jumps to $9.31 per quart. No thank you....I'll go with Rottela T6 in that case. ...

This reminded me, when I have bought oil in 2x 4qt containers, it is ALMOST enough. My cars need 8.5 qts.