I'm new to this message board so I apologize if this has been discussed before. I've seen lot's of info on what type of synthetic to use and change intervals. However, I haven't found much info on WHEN it's okay to make the switch to synthetic motor oil. I've heard that the rings must be allowed to seat first (break-in), but I've also heard that on modern vehicles, this is not an issue. Can anyone give me some advice. I just bought a '99 XLT with a 4.6 V8. I'd like to run synthetic, but I'm not sure when I should start. Thanks for the help!

 

I switched @ 6,000 miles -- with my second oil change.

Good luck,

Jim

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'99 F-250 LD 5.4L SC XLT 2WD in White/Silver (w/ EVERYTHING 'cept leather and engine block heater) -- added: SnugTop Hi-Liner & carpet kit, Donnelly electrochromatic/compass mirror, K&N filter, SuperWhite 9007 bulbs, IAS shocks, 3" Induction Airbox Mod, more to come... (Westin side bars, cat-back exhaust, electric fan, and Superchip are next)

 

MJ, Some new vehicles come from the factory with synthetic motor oil, I went with Mobil1 after my first oil change at 3,000 miles. I look at it this way....even if it is okay to use synthetic right off the start, I feel better knowing that my engine was broken in properly.

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99 F150 XLT Silver 2WD S/C 4.2 5-speed, Superchip, Flowmaster muffler // Rear door switch guards - check them out at http://www.geocities.com/motorcity/show/5031