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I like Amsoil syn. 5W30 myself. I put it in and leave it in for a year. I change the Amsoil filter every 3 months and it's been doing well, and staying very clean. I only drive about 13,000 - 14,000 miles a year. Amsoil says you can leave it in for one year or 25,000 miles from what I've read. Since I don't clock a lot of miles, I go by time instead.
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1997 4Runner Ltd. Bilstein shocks, rear E-locker & riding on 32s.
Mods Pics
Tech articles, write-ups & more are available on my website.
http://www.hboss.net/4runner
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