Penn Dexron III analysis

[Neil Womack]

97 Saturn SL-1 automatic transmission. The manufactures calls for a partial change every 40k with a spin on filter change. This oil was Penn Dexron III.

miles on vehicle 135,000
miles on oil 35,000
Saturn spin-on filter changed at every oil change.

code:

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copper 2

iron 9

chromium 0

aluminum 1

lead 0

moly 1

phosphorus 311

zinc 32

magnesium 7

calcium 100

silicon 4

vis 5.02

SAE 10w

sulfur 43

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Comments?

 

[Titanium_Alloy]

WOW! Although ATF sheared down quite a bit this analysis seems to good to be true! 35k miles on mineral Penn. - I say very good. There was an analysis on Pennzoil DIII posted in UOA section by VaderSS. I think he also vent 35k miles, but your results are very good compared to his. What's the value for Boron?

Regards,

 

[VaderSS]

His engine is probably not overloading his transmission the way mine is, and he's probably not driving the car as agressively as mine is driven, plus, I have a hellacious commuter circuit here in Houston.

 

[jthorner]

Pretty good results. I wonder how much can be credited to your changing the spin on ATF filter at every oil change and adding a little make up oil at that time.

You make we want to retrofit such a filter arrangment on our automatic transmission equipped vehicles!

John

 

[Neil Womack]

For the last year this has been very low usage vehicle. I much prefer my VW TDI. My wifes uses the Saturn to make town runs several times a week. 40 miles round trip with multiple stops.
Totals around 7000 miles a year.

This is proving destructive to the motor oil but apparently not to the ATF. Looks like I can extend the 40k change interval.

 

[MolaKule]

It would be nice to know the TAN or TBN.

The viscosity has sheared down from about 7.5 to 5.0 cSt.