Car just out of warranty issues....Dammit!

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mimico_polak said:
Never serviced. Fluid was inspected around 40k and also at 80k but that's it. No issue was seen then.
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Fluids cheap as you are learning parts are not.

I'm willing to bet that it's past its service interval and unless you have the ability to measure viscosity and PPM then a visual inspect is useless.
 
City driving, in Canada, you should use the 'severe service' interval. I personally use 50,000km interval for auto trans fluid changes.

On a different note, I observe many people driving cars in city traffic that stop a distance away from the car ahead (or stop line at red light). They then spend the time waiting for the green creeping up, either slowly or starting/stopping several times. This is slipping your clutch and adding heat to the trans fluid. There are also many people who bang the auto trans from reverse to drive without being fully stopped.

OP - I'm not saying such is in your case, but I sometimes think that some manufacture/transmission reputations are not warranted as they are user error.

Now, if you believe that your long-life coolant really lasts for 5 years...
 
I'm confused...how does creeping in drive vs being stationary in drive slips the clutch and adds heat to trans fluid? Only thing slipping is the torque converter, as designed...

FLSTC said:
City driving, in Canada, you should use the 'severe service' interval. I personally use 50,000km interval for auto trans fluid changes.

On a different note, I observe many people driving cars in city traffic that stop a distance away from the car ahead (or stop line at red light). They then spend the time waiting for the green creeping up, either slowly or starting/stopping several times. This is slipping your clutch and adding heat to the trans fluid. There are also many people who bang the auto trans from reverse to drive without being fully stopped.

OP - I'm not saying such is in your case, but I sometimes think that some manufacture/transmission reputations are not warranted as they are user error.

Now, if you believe that your long-life coolant really lasts for 5 years...
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Red_Liner740 said:
I'm confused...how does creeping in drive vs being stationary in drive slips the clutch and adds heat to trans fluid? Only thing slipping is the torque converter, as designed...
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Whoops - meant the torque convertor. Stall state is one thing, releasing the brakes makes it start to drive the turbine (at high slip rate). Akin to people with manual trans using the clutch friction zone to hold them on a slight incline.
 
Red_Liner740 said:
I'm confused...how does creeping in drive vs being stationary in drive slips the clutch and adds heat to trans fluid? Only thing slipping is the torque converter, as designed...
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I thought the same thing.


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There is no wear in a torque converter which is creeping, no matter the slip rate. There are no friction surfaces rubbing against each other in a torque converter the way there is in a friction clutch in a manual transmission (or automated-manual or DSG). The forces are transmitted completely through changing direction of hydraulic fluid. If the engine is at or near idle speed, the power consumed and heat produced is pretty small and easily within the capability of the transmission cooler. Riding your brakes and making the car creep like that may wear out your brakes faster, but not the torque converter.

Transmissions do contain friction materials inside the multi-plate clutches, but the slip between those friction materials happens when the transmission is changing gear. If the transmission controls are having issues and are causing low line pressure or the clutches are almost worn out so that they won't hold with normal line pressure, those clutches can slip under load, and that is bad.

Plenty of automatic transmissions these days have no scheduled maintenance at all. No inspections, no fluid changes, no filter changes. "Filled for life". Yep, when the fluid becomes too contaminated through the normal gradual wear of those clutch plates and starts causing issues and the transmission fails, that was the transmission's life!

I don't know what the weak point is in the 6-speed front-drive Hyundai automatic but I do know someone who had a previous-generation Elantra which was on its third (I think) 4-speed automatic by the time the warranty was nearing its end. After that transmission went in and the car was still under warranty, the car got traded in for something else.
 
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