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    Synthetic only for turbo engines?

    A few yrs. ago, a service writer at a local VW dealership had his tech. put Castrol full synthetic in my '03 New Beetle's Turbo 1.8 engine. They had been putting Castrol GTX 5W30 dino up to that time w/o any probs. whatsoever. When I asked why they switched oil on me, the service guy said...
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    HDEO in high mileage pickup

    I'm a "newbie," so am still learning (quite a lot) by reading this site. I have a '91 Chev 1500 reg. cab pickup with 126K actual miles on the 4.3L V-6 motor and have most recently been running Supertech dino 10W30 with the Supertech filter, but I've been getting a good wiff of blue smoke on cold...
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    One interval for oil changes and another for filter changes?

    Why do the auto manufacturers (or at least the ones I encounter) say, in their vehicle owner's manuals, to change oil at, let's say, 7.5K miles and not change the filter until some ludricrous interval like, for example, 15K? Why would you want to put new oil thru an old, "contaminated" filter as...
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