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> From: email@example.com (Robert Wheeldon)
> Does anyone on the q-list have an opinion about switching to synthetic Auto
> Trans fluid. I'm considering it but I cannot (won't spend the money) drain
> the torque converter. My thoughts are drain and re-fill the trans several
> times until I end up with something better than a 50/50 mixture of original
> fluid and synthetic.
> Will regular AT and synthetic AT mix?
Yes. Limits advantages of synthetic, but drain all you can and
you're at least 30% synthetic on the first change. These oils are
compatible and work together just fine.
> Is there any advantage to synthetic AT fluid?
Absolutely. Primarily in three characteristics: 1) It dissipates heat
better than petro; 2) It resists breakdown from heat better than
petro, therefore lasting longer; 3) It is even more detergent than petro,
assuring no buildup of varnish will take place. I run Amsoil
synthetic in my 1990 200.
> Is there any advantage to mixed conventional and synthetic AT fluid?
It's better than 100% conventional, not as good as 100% synthetic.
> Is there a way to drain the torque converter short of pulling the transaxle
No. Best way is as you describe above - do about three changes,
draining all you can each time. Drive for days in between. You will
eventually have a very high ratio of synth-to-petro.
My suggestion is to drain by loosening the large nut on the dipstick
filler tube on the left side of the drain pan. DO NOT cross-thread
this nut going back on!!
Al Powell, Ph.D. Voice: 409/845-2807
107 Reed McDonald Bldg. Fax: 409/862-1202
College Station, TX 77843
"Some people can tell what time it is by looking at the
sun...but I have never been able to see the numbers."
[From 5th/6th grade essays....]