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I am a service writer at a dealership in KC. I have a customer who has told me that once you start synthetics in your vehicle, you should continue synthetics for the life of the vehicle. Is there any truth to this? I told him there are 100 opinions for how synthetics should be used and there is no concrete answer.

Thanks,
Billy
 

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2002 Escalade, 2004 Cts-V, 2006 Hummer H3
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I have heard the same thing, once you start the synthetic's you gotta stick with them... My dad does that in his vette, and hes the one who told me that... Maybe its just an "Urban myth"...
 

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Castrol, mobil, and Royal Purple all have 800 #'s on their bottles. I called, and every manufacturer said there is no harm in switching back and forth. They said you can top off w/ regular oil if you are a quart low. They also said you can go around 6000 mi. between changes, but have to still change the filter at 3000 mi. Of course add a quart if you change the filter.
 
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