What type of ATF and Motor Oil is best? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 08-20-2004, 10:38 PM   #11
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I run Amsoil in the crankcase. I have no complaints. For reference, Amsoil makes a couple of different full synthetics. They have one that is pretty much the same as any other synthetic, then they have one that they rate for 25,000 miles. The regular one is cheaper, the 25,000 one is around $6 to $7 a quart. I run the extended stuff just because I put a lot of highway miles on my car and don't have the time to change it every 3,000 miles. Right now I'm changing it every 9,000 or so.
I must say, when I switched from Mobil 1 to Amsoil, it seemed like I got higher oil pressure, but then again this could just be the placebo effect kicking in.
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Old 08-21-2004, 12:03 AM   #12
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Thanks Drifter that Lucas Additive is off our list to try.
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Old 08-21-2004, 01:35 AM   #13
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Originally Posted by Dirtypaws
Does anyone use F-Type Dextron (of whatever brand) in their transmissions? I've been told that it is slightly better than typical Dex. Let me know.
Do NOT use Type F Transmission Oil in a GM Transmission. Use ONLY oil that reads Dexron III or Mercon/Dexron III on the label.

Type F oil was used in pre-1980 Ford Xmissions.
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