ATF change for Saturn L200. Can I mix dino w/synthetic?

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My thought process was that SOME synthetic is better that NO synthetic. Since the wife won't let me spring for the $50+ it would cost to buy all synthetic, I was curious about just getting a quart or two to go with the balance of the 8 quarts I need. Her car has 50k miles on it and this will be it's first fluid change..... Any thoughts? Thanks, Ashley
 
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I would not worry about it to much! The most important thing is that you are chageing it! Yes synthetic trany fluid is better then non-synthetic but I doubt you would see to much difference unless you plan on keeping this car for a long time!!
 
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Flash: You can buy synth blend ATF which is essentially what you are proposing. I have had good luck with Valvoline Dura-Blend ATF, not sure if it is available in your area. Brewing your own "blend" would probably be OK, but there is always that potential for so-called "additive clash".
 
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There's always the torque converter to consider when they design synthetic ATF. Most but not all don't get drained upon changeout. I would then assume (dangerous [Smile] ) that since the typical ATF changeout leaves more behind than the typical engine oil changeout, their additives would be (designed to be) more compatible even across brands.
 

driven2services

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Originally posted by eljefino: There's always the torque converter to consider when they design synthetic ATF. Most but not all don't get drained upon changeout. I would then assume (dangerous [Smile] ) that since the typical ATF changeout leaves more behind than the typical engine oil changeout, their additives would be (designed to be) more compatible even across brands.
Yeah, 99% of the time only half or less gets changed...I wouldn't worry about mixing anything. If you were going to do that I would get at least 2 or 3 quarts of synthetic.
 

Flash

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So, if my owner's manual says the capacity of the transmission is 7 quarts, would some one care to hazzard a guess as to how much I'll drain - and need to replace - when I drop the pan????
 

driven2services

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Originally posted by Flash: So, if my owner's manual says the capacity of the transmission is 7 quarts, would some one care to hazzard a guess as to how much I'll drain - and need to replace - when I drop the pan????
Probably about half of that. My Jeep transmission takes 8 quarts but the pan only holds 4.
 
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Flash, If your concerned about the amount drained, just take an old gallon jug, and pour the drainpan fluid in it. This will give you a rough estimation of how many quarts were drained...  -
 
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