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Q: motor oil brand change on 1995 Chevrolet G Series Van (G20)

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have been using Havoline oil for many years and have been very happy with it, but it has suddenly become unavailable in my area, Tucson, AZ. The company has been of no help in locating it. I know various oils have different bases and woul like to know a brand or brands that would be comparable in composition that would be unlikely to cause any problems in blending with what's left of the Havoline on my next oil change. Thanks.
havoline is a Texaco brand try this location

DOC'S Esperanza Texaco
Address: Esperanza Texaco. 61 W. Esperanza Blvd. Green Valley, AZ 85614. Telephone: 520.625.4511
I recommend switching to Castro GTX oil. Havoline oil cooks into sticky brown gum on internal engine parts. Saw a demonstration of the GTX at a motorcycle trade show 30 years ago and was AMAZED at the difference in GTX engines. NO GUM! As clean as a new engine inside. GTX was originally formulated for British cars that operate under extreme conditions. Works great in motorcycles and cars! I have 3 cars with over 300,000 miles on them. NO major repairs ever to engine other than stuff that's always going to wear out like timing belts and fuel pumps.
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