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Re: Dino juice/Synthetic Lg Viscosity Ranges:good or bad?

I've heard that a wide viscousity range can cause coking problems and that
you should use a viscosity index with the narrowest possible range for your
climate.  Can anyone verify this?  Thx.  glenn
>>I want to put in synthetic oil into my 20V this month.. but I have always
>>run only dino. When I do the switch, do I have to do anything special?
>>Like drain it after 1000 mi or so due to the detergency? Or can I just
>>leave it in its full term (6k I think??)
>>Also.. which brand is best.. or should I use the blend?
>Most modern Synthetics are completely compatible with Dino juice, so you
>can just change it and leave it.
>I looked into it a while ago, and decided on Castrol Syntec 5W50.  It seems
>to me that to the extent that it keeps its viscosity range with time, that
>range is a big advantage.  I have been watching a long discussion on the
>Mercedes list, and some claim that Castrol uses a lot of viscosity
>enhancers to get that range, and that it will become more narrow with use.
>I change it twice a year anyway, so it doesn't seem to me to be a problem.
>If you are inclined to try to run synthetic much longer than normal stuff,
>you might look for a synthetic with a narrower range.
>Castrol's recommendation is to follow the manufacturer's change intervals.
>That is basically what I am doing.  I had no problems with the change, but
>I didn't see any of the improvements sometimes claimed.  The biggest
>advantage to me is in peace of mind and somewhat extended intervals (I
>wouldn't wait as long using Dino juice, regardless of what the menufacturer
>One guy's opinion.
>Richard Funnell,
>San Jose, California
>'83 urQ
>'87 560 SL