Thanks Undummy. Why do you think SPIII is so bad?
GM has had 'em for years...quote:
Originally posted by unDummy:
The manufacturers need an ATF oil life monitor since blind mileage based intervals isn't cutting it in the real world.
Hyundai also specifies 30K service under "severe service". (Extreme heat and/or urban crawl qualify.) Same recommendation went for my '94 Honda, too. I suspect those two automakers plus KIA aren't alone if one closely examines the "severe service" schedules in owner's manuals.quote:
Originally posted by The Critic:
Correction: Kia is probably the only OEM that still requires an ATF service @ 30K under city driving, and 100K under normal service.
I posted about actual ATF OLMs in another thread. GM has one on their Equinox and on many of the Cadillac vehicles. These ATF OLMs are based on operating temperature of the fluid, like you've expected.quote:
Originally posted by unDummy:
Critic, this is a thread concerning ATF and not engine oil. Seems that your responses are confusing the 2.
Concerning OLMs, I want to see an "A.T.F.L.M." with an actual algorithm(temperature being the most important variable) and not simply mileage based or bogus driving style based, which both are useless in the real world.
Really... Then by your definition, there would be no conflict in substituting Mercon V for SP III? Or Dexron VI for Toyota T-IV? Me thinks there are clutch material frictional differences the various proprietary ATFs' friction modifiers are designed to cope with. Personally I suspect that ATF+4 is awfully close, if not identical, to SP III - but until I see irrifutable proof of that conjecture from a recognized, authoritive source, I'll continue using SP III in my Hyundai AT during its 10yr/100K mile powertrain warranty. (Hyundai's also a company which is on record {TSB} that it'll summarily void its warranty on its automatic transmissions if its inspection during tear-down reveals use of an unauthorized ATF or aftermarket ATF additive.Quote:
The clutchband materials have improved over the years to last longer when allowing a slip controlled shift. And, I haven't seen clutch material that is fluid specific.