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logic behind no trans dipstick? #5438307 05/25/20 11:25 AM
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flinter Offline OP
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Hi,

Exactly what is the car manufacturers logic in moving to eliminate the dipstick for automatic and CVT transmissions? Is it to say you have a "sealed transmission" and it's a "lifetime fluid"? Any here know that is nonsense. And how would you even know if the service for a drain and refill or a flush was ever really dont since you can not confirm it WITHOUT a dipstick to check??

Last edited by flinter; 05/25/20 11:26 AM.

2017 Hyundai Elantra SE Value Edition
Purchased new with 10 miles
Re: logic behind no trans dipstick? [Re: flinter] #5438313 05/25/20 11:29 AM
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IMSA_Racing_Fan Offline
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I don't know but it sucks.

Re: logic behind no trans dipstick? [Re: flinter] #5438314 05/25/20 11:29 AM
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Hermann Offline
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Mostly the cost of not having to hang a dipstick. Also brings more people in with bad trannys 8 years later. Another factor is amatuers not understanding how to check and fill properly at operating temps.


2018 Ford F-150 XL Reg Cab - 3.3L NA V-6
Motorcraft 5w-20 Syn Blend and Motorcraft FL-500s

1991 BMW R100GS 20w-50 Maxlife & Mahle OX36D filter
Re: logic behind no trans dipstick? [Re: flinter] #5438323 05/25/20 11:36 AM
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Mr Nice Offline
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Cost.

And most people will go to dealerships to drain / refill ATF.

Re: logic behind no trans dipstick? [Re: Mr Nice] #5438340 05/25/20 11:48 AM
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flinter Offline OP
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Mr Nice,

But with NO dipstick, how do you know the service was ACTUALLY done??


2017 Hyundai Elantra SE Value Edition
Purchased new with 10 miles
Re: logic behind no trans dipstick? [Re: flinter] #5438341 05/25/20 11:49 AM
Joined: Oct 2009
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JohnnyJohnson Offline
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You bring it to the Stealership or you risk running your Trans low on ATF and damaging it. Good test case for a class action law suit!


2004 Corolla 140556
Out: Pennzoil Platinum HM 5W-20 ST 4386
In: Valvoline Synpower Full Synthetic 5W-30 Purolator PureONE
2006 Duramax 77117
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In: Rotella Dino PH9100 11-3-19
Re: logic behind no trans dipstick? [Re: flinter] #5438345 05/25/20 11:54 AM
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ripcord Offline
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It's your own dang fault you don't have a lift and a $3000 scan tool if you want to check your transmission fluid </sarcasm>

Re: logic behind no trans dipstick? [Re: flinter] #5438350 05/25/20 11:58 AM
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Astro14 Offline
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Because in the analysis of numerous transmission failures at GM, rag lint was found contaminating the valve body and causing the failure.

Whether professional or amateur mechanics were that careless doesn’t matter. Careless mechanics caused failures and warranty claims.

It was decided that non-serviceable transmissions were less likely to have warranty claims.


32 Packard 15W40
01 Volvo V70 T5 0W30 AMSOIL SS
02 Volvo V70 T5 0W30 Edge
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Pennzoil Ultra
Re: logic behind no trans dipstick? [Re: flinter] #5438352 05/25/20 11:58 AM
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IMSA_Racing_Fan Offline
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The logic: transmission last the warranty period. Transmission then dies, you get a huge repair estimate, you buy another vehicle.

Re: logic behind no trans dipstick? [Re: flinter] #5438359 05/25/20 12:15 PM
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Pelican Offline
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There were 3 reasons;
1) To stop incompetent DIY doing damage or incompetent mechanics
2) To create more business for dealerships
3) To save on the cost of the dipstick set-up.

that's the order of importance according to what I've heard from people in the business.
In Fact if any transmission failed and had to be replaced under warranty the whole unopened transmission including fluid had to be shipped to the manufacturer so that it can assess the reasons for failure. 2 & 3 are corollaries of 1

Last edited by Pelican; 05/25/20 12:18 PM.
Re: logic behind no trans dipstick? [Re: IMSA_Racing_Fan] #5438360 05/25/20 12:15 PM
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Astro14 Offline
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Originally Posted by IMSA_Racing_Fan
The logic: transmission last the warranty period. Transmission then dies, you get a huge repair estimate, you buy another vehicle.


Or:

Inept mechanics kill transmissions. Protect transmission from ineptitude by sealing it.


32 Packard 15W40
01 Volvo V70 T5 0W30 AMSOIL SS
02 Volvo V70 T5 0W30 Edge
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Pennzoil Ultra
Re: logic behind no trans dipstick? [Re: flinter] #5438366 05/25/20 12:21 PM
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Posts: 655
Sam_Julier Offline
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I keep a can of compressed air handy when doing an AT fluid flush. Before inserting the the dipstick it gets a shot of air.

Sam


2013 Toyota Avalon Hybrid TGMO 0W20, 81k
1993 Volvo 245 T5 10W30, 168k
1993 Volvo 244 T5 10W30, 177k

Re: logic behind no trans dipstick? [Re: flinter] #5438371 05/25/20 12:22 PM
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JimPghPA Offline
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My understanding is that one of the big things that degrades fluids is exposure to air, and the very small amount of moisture that condenses out of the air and into the fluid. Over time that can add up to a lot of oxidation and moisture. When you have a dip-stick every time you go up or down a mountain, or the barometric pressure changes a small amount of air moves in or out of the air space above the fluid in your trany. When it moves in it carries new oxygen and water molecules (moisture). Some of that interacts. A sealed system does not have the fluid degrade anywhere near as fast.

I have seen some engineering specifications for some fluids and there useful life that specified different life expectancy for use in sealed and unsealed systems.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: logic behind no trans dipstick? [Re: flinter] #5438375 05/25/20 12:26 PM
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MCompact Offline
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Performing a drain and fill on an 8HP isn’t too bad. A thermometer can substitute for a “scanner” although my Carly app can also read the ATF temperature.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i M Sport


Son's
2009 328i

Buy what makes you smile...
Re: logic behind no trans dipstick? [Re: flinter] #5438378 05/25/20 12:29 PM
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JimPghPA Offline
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The Osprey military aircraft has a filter containing material that absorbs moisture from the air before it can enter the area where the fluids are for all that is going on inside it mechanically. That filter has to be changed when required to keep moisture out of the fluids.

Moisture is a big concern with fluid performance and life.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

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