I did find that Mobil does make a Delvac 1 synthetic transmission fluid 50, which is equivalent to a 90WT, which carries a GL4 rating, which is also now available in gallon jugs. Something worth asking your Mobil rep about.
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Charles Navarro
President, LN Engineering and Bilt Racing Service
http://www.LNengineering.com
Home of Nickies, IMS Retrofit, and IMS Solution
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