Can Diamond ATF SP IIII be used for.......

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Originally Posted By: LubeTechBob
Well I have a 1991 DSM which is a Plymouth Laser/Mitsubishi Eclipse/Eagle Talon, I own the Laser but all were built by Mitsubishi!

Oh, I see. As someone else said, if it calls for ATF, I'd imagine that you're good to go.
I am using chrysler atf+4 in both my trany and PS on my mitsubishi made chrsyler products that require diamond star-III
If you take your chrysler or dodge mitsubishi made cars in for service, they only use the atf+4 not the diamond star.

I buy the walmart brand atf+4. It's ablut half the price of the mopar stuff.
Mine calls for Dexron III in the power steering system, but I am not sure about newer applications. Will check and get back.
Mitsubishi vehicles require Dexron III in their power steering. SP III is only specified for A/T units.
My Plymouth Laser O/M calls for ATF +3 or Dexron II or III, but I thought since it was made by Mitsubishi, that the Mitsubishi Eclipse version would call for Diamond ATF SP III instead. Have never seen a Mitsubishi Eclipse O/M to check if this a fact or not. Please advise.
It gets confusing these days with transmission fluid and power steering fluid both being sold separately. Then you have the many different alternatives listed in the owner's manual. Personally I would go with Dexron III.
I do know that from 2003 and up they use Mitsubishi spIII I am unsure of anything older.

I did a little goodle searching and older Mitsubishi made cars do use dexron in the ps system.

I would use whatever is in the owners manual. For my two mitsubishi made sebring coupes (03 and 04) the owners manual says diamnond star atf. Thus I have been using the chrysler atf+4 as the dealer would use.
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To save money! Transmission requires the HFM'd ATF. The PSF doesn't and uses a cheaper fluid. Automakers don't make sense since many decisions are made by accountants.

I don't use SPIII in transmissions requiring it. I wouldn't bother using it as the PSF.
If your PS requires DexIII, then a good full synthetic DexIII equivalent ATF should be used.
Originally Posted By: LubeTechBob
Why Would the P/S system use one type of fluid, and the transmission use another?

Using the same fluid for both systems would make more sense?

Because the P/S system may use different materials than the transmission, and some materials in their P/S system may not be compatible with the ATF required for the transmission.
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