On Aug 31, 3:08*pm, RickH wrote:
I went to the Jiffy Lube this weekend and thought I'd splurge and put
in some Castrol Syntec as they were having a sale on it, (vehicle 2007
Toyota RAV4). *When I asked for the Syntec the guy said that once you
go to a synthetic oil, you should stay on it and not go back to
regular oil. *Well since the the regular cost of a Syntec oil change
is double, I said forget it and just put in regular oil.

First, is it true what the guy said about it being "bad" to go back to
regular oil after using synthetic? *If so, why? *I had a car in early
the 90's that loved Mobile 1, ran great on it, I dont remember
dedicating that car to Mobile 1 though for all time, I'm sure I used
all different oils.

Thanks
Rick

I bought a ATV several years ago and the dealer told me the same thing
- "If you break it in on synthetic you need to keep using it or it
will burn oil with conventional oil". I bought a ZTR mower this year
and the service manager told me the same thing. I don't know if it's
true or not but there are a lot of service departments telling their
customers that it is.

Red