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I poked around in the uoas, yours did better than most. Most were fords, and they ended roughly 10-10.999cst. Still solidly in the 30 range.

https://aisinaftermarket.com/resources/product-brochures In 2021 they have it listed as 5.6-6.2cst. Matches Toyotas roughly

That guy sells engines, I'm going wait on what he says about the block until I see further proof. Any block can frett when pushed hard, when its common you hear about it.

I would run 5w40, I don't see a downside. What advantage does the 10w30 have. When 5w40 is at the end of its interval it becomes......10w30

I won't use any multi vehicle fluid that is formulated for cvt applications. I might try the import multi from Castrol, Mercon v approval is close enough to atf4/dex3 for what I'm doing.

Dodge 11.5 AAM comes with a torsen from factory. Mopar calls for a synthetic fluid, from everything I have read.

My 90k mile ford looked identical using motorcraft 5w20 the last 40k miles. 7500mile intervals. Looks good to me.

Atf4 is a quality spec as is. If you go on Randy's transmission for a 68rfe oil change, they sell a certified fluid to go in it.

I agree on testing with large capacity setups, for sure. Its convenient that Tom is invested in a testing facility. In response to the thread title, a performance rebuilder on another forum is recommending this fluid in a lot of applications. Must be good.

Within the oem guidelines, Im a fan of towing/working the engine early. The oil consumption might go down with more use.

Are you tempted to use the same oil in a 30w and do another uoa? It won't definitively prove anything, but it would be interesting.

I would find the best price on an appoved atf+4. Valvoline is 31$ a gallon and claim free shipping over 35$.

Some PSF have a lot more zddp for wear protection. I'd like to know which is better myself.

Rare for a pds to have so much info. Thanks for posting.

I looked at the pds for xsp 15w40, the one I found has cummins and detroit certs, but was "recommended" for ford F1. javascript:openMSDS("PDSDetailPage.aspx?docDataId=663457&docFormat=PDF%22)

Thread '2002 Tahoe 5.3L - HPL HDEO 10W-30 - 9,748 Miles' https://bobistheoilguy.com/forums/threads/2002-tahoe-5-3l-hpl-hdeo-10w-30-9-748-miles.345112/ 1.74ppm/1000 miles Post in thread 'Mobil 1 EP 5w-30 @ 13k mi; GM 5.3L 238k mi'...

Transmax Manual Multivehicle 75W-90 - Castrol - PDS & MSDS https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/289BE6B2F59EFABE802587D1004A8C39/$File/wepp-bzlqgp.pdf Syntrans FE 75W - Castrol - PDS & MSDS...

How about Mystik 15w50, cst@100 is 19.5

I look for the ford spec, they like the phosphorus. https://bobistheoilguy.com/forums/threads/ford-presentation-on-the-1-000-1-200-ppm-phosphorus-requirement-for-heavy-duty-diesel-engine-oils.360833/

This is the best method when the fluid is junk or unknown. Letting it intentionally mix with ruined fluid is a waste.