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If you have the cash and do any seriouse RPMs (like high speed cruising) or tow any heavy loads in a regular basis...sythetic is not a bad idea.
Many will scoff at the idea, but our lab shows that it does indeed help more than most ppl would ever think.
Acording to our lab, if your oil is original in there, and it has the typical 3.73 or numeracly higher gears, and asuming you have over 100K on the clock..your oils is only working at about 25%- 45%.
This is an independent lab that we deal with all the time for the past 12+ years.
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