Going to drain the ATF from my 300sd and would like to replace the ATF with Synthetic.

Is it a good idea to use Synthetic, Redline, Amsoil?

I want this transmission to last a long long time.

If Dextron ATF will give same results then I will stick with that and replace it a regular intervals

Please advise

In this forum there don't seem to be many people running synthetic transmission fluid in the older cars. In previous groups (mailing lists) that I belonged to, it was more common, mostly Mobil 1. Some claimed that it improved shift quality.

As far as I am aware, however, there is no hard evidence that running synthetic ATF will have any long-term benefit for the transmission.

Given the cost of doing a complete drain and refill (including the torque converter) using a quality synthetic, in the absence of strong evidence, I would stick with regular Dextron-compatible ATF.

I run synthetic motor oil, but run regular ATF.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

I too don't believe there is any benefit to running synthetic in an old car. You are unlikely to drain out all the old fluid anyway.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes