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Your engine builder should know the answer to that question and the period can vary. I've generally heard of 500 miles, after that anything goes. My engine builder broke my engine in on their dyno so I was jamin' as soon as she was installed. Pure synthetic is best but a blend will be better than none at all. You may notice on the inside of the dipstick cap a white, slimy-gooey substance over time. This is due to the characteristics of the blend (pure synthetics, in my cars, don't have this byproduct) and isn't anything bad. Because the engine is still new changing to a synthetic shouldn't cause any problems like what would happen if you made the change 10,000 miles later. You're using a full flow system, right? Toby Erkson, air_cooled_nut@pobox.com '72 VW Squareback 1.6L bored and stroked to 2.0L '75 Porsche 914 1.8L Portland, Oregon, http://www.geocities.com/MotorCity/8501/ ______________________________ Reply Separator _________________________________ Subject: Re: synthetic oil Author: type-3-errors@umich.edu at SMTPGATE Date: 10/21/97 9:55 AM How many miles makes for sufficient break-in for a new engine before switching over to synthetic? I picked up a case of Valvoline semi-synthetic 10W30; my engine has a couple of hundred miles on it. (I bet we'll get 100% agreement that semi-synthetic is a semi-good idea, eh?;) -Greg '69 & '71 Squarebacks '63 Beetle