Follow the owner's manual recommendation(Schedule A) for mostly highway
mileage. Thus you won't have warantee problems. In that schedule you are
supposed to go 7500 miles/12000km/6 mos on oil. And filter every other oil
change. IMO, it's foolish to run new, fresh oil through a dirty filter.
Dr. Pat
----------
>From: Trevor Stott <trevor.stott@sheridanc.on.ca>
>To: dakota-truck@buffnet.net
>Subject: DML: Synthetic Oil change interval
>Date: Tue, Apr 13, 1999, 5:04 PM
>
>
> I've noticed a number of differing opinions as to the change interval when
> using Synthetic oil vs Dino brandX. I do about 30,000 kilometers a year
> (18,000 miles) and 90% of it is highway driving. I understand that regardless
> the filter should be changed at 3000 miles but what about the synthetic oil?
>
> Thanks
>
> Trevor
> 99 5.2L CC
>
>
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