I changed out the Havoline 10w-40 in my 1976 Buick Lesabre 350 V-8 for Mystik 15w-40 and the results were better than I expected. Way smoother acceleration and overall better performance. I just took the cue from some here to use a 15w-40 HDEO for summer use. I'm glad I took the advice.
Mystik 15w-40 in the old beater did great!
- Thread starter Rob Taggs
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Good to hear! Makes me want to head to TSC even MORE often!
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