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Inquiring Minds Want to Know

2463 Views 10 Replies 6 Participants Last post by  GregW
The variations in recommended oil change intervals has perplexed me for some time and I haven't seen any explanation as to why there is a difference. If I've missed the reason previously explained, my apologizes. If there has been none, can anyone shed some light on why there is such a disparity? Without any difference in the combustion components, I can't see that US-based cars would foul oil any faster than elsewhere. Similarly, its hard to believe that US fuel blends would cause oil contamination at twice the rate of the UK (for example). Similarly, I doubt oils commonly used in the US are different (if at all) than those used elsewhere. The cynical half of me thinks Porsche North America might have shortened the interval to provide additional business to US-based dealers :|.
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Porsche2018, I agree with your previous suggestions regarding more frequent oil changes. I do that as well. However, that doesn't change the fact that Porsche has contradicting oil change intervals. All I'm seeking is some rational explanation as to why that is.
See Point #2 in this two-month-old blog entry on Amsoil's website.

EU countries require a different type of oil than the U.S. does to extend service intervals and, thus, decrease the amount of discarded oil. The post includes some dated info, but I see corroborating evidence in several other places after a good ol' Google search.

Also evident: a push toward thinner oils such as 0W-16 for use in economy cars and hybrids, led by Honda and Toyota. The U.S. auto industry has apparently flat-out rejected the trend. Here's an article about that on Autonews.com, a semi-trade publication for the auto industry based in Detroit.

Longer service intervals between U.S. and EU vehicles appears to have been a 'thing' since at least the mid-2000s because of the stricter oil standards across the pond.
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