2000 VW Passat 1.8L mileage: 96,000. I've seen lots of questions on your site regarding whether you can use 87 octane fuel in a car that recommends 91 octane premium. You reply to most of them that 87 is okay. But on a couple, you say to stick to 91. What's the differing factor in these? My engine is a turbo-charged 4-cylinder. Is it best to stick with premium fuel on any turbo, or is there something else to take into consideration? Todd.
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Tuesday, October 12th, 2010 AT 11:33 PM