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<blockquote data-quote="Shadowrider" data-source="post: 3926739" data-attributes="member: 3099">They&#039;ve been forced to take almost all ZDDP out of engine oils because it degrades catalytic converters. There&#039;s still some in there but it&#039;s a tiny fraction of what they used to use.I run Amsoil Signature Series or XL Series depending on how many miles the vehicle will get driven in a year. I change oil once a year. Been doing this for years.If I couldn&#039;t get Amsoil I&#039;d use Pennzoil Platinum Ultra since some of the testing I&#039;ve seen was close to Amsoil.I&#039;ve ran a car 68k miles in one year and changed the oil 4 times that year (technically 3.something times since the 4th change was at the 1 year point). It lasted another 175k after that point. In this pic the car has almost 200k miles. Notice how clean totally sludge free it is? That&#039;s Amsoil at 1 year oil change intervals. Probably around 15-20k a year at that point in time.[ATTACH=full]331304[/ATTACH]</blockquote>

[QUOTE="Shadowrider, post: 3926739, member: 3099"] They've been forced to take almost all ZDDP out of engine oils because it degrades catalytic converters. There's still some in there but it's a tiny fraction of what they used to use. I run Amsoil Signature Series or XL Series depending on how many miles the vehicle will get driven in a year. I change oil once a year. Been doing this for years. If I couldn't get Amsoil I'd use Pennzoil Platinum Ultra since some of the testing I've seen was close to Amsoil. I've ran a car 68k miles in one year and changed the oil 4 times that year (technically 3.something times since the 4th change was at the 1 year point). It lasted another 175k after that point. In this pic the car has almost 200k miles. Notice how clean totally sludge free it is? That's Amsoil at 1 year oil change intervals. Probably around 15-20k a year at that point in time. [ATTACH=full]331304[/ATTACH] [/QUOTE]

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