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80W-90 Valvoline, you should be able to get it at any parts store. Look by the oil...
 

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Did anyone see Popular Hotrodding TV show this weekend?
By replacing the motor,transmission and rear end oil to
Royal Purple Synthetic they picked up 8 HP on the chassis dyno in a 2000 Firebird.
Tony
 

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The guy who rebuilt my engine and transmission is seriously into Ford racing. He recommends pure synthetic 10W30 in both transmission and differential. I'd like to hear more about the pros and cons of that weight vs 80W90.

http://a1.cpimg.com/image/A3/89/10694051-d3cd-0122006F-.jpg
9F02G205783
 
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