What conditions give an OCI over 1 year?

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rumple

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Imagine you have the magic wand of oil suzerainty - you can wave it and have whatever operating conditions you want.

Under what set of conditions, if any, can one go more than one year for an OCI? The reason I ask is I have a lightly used 2002 Ford Explorer with the V6 4.0L engine. Is there any possible set of conditions that could make it possible to prudently go over a one year OCI? All highway? Part? None? I noticed that occasionally one will see a decent UOA for long time oils.

Rumple
 
If you drove 4,000 miles per year almost all on the hwy with a synthetic then no problem going 18 months. You could probably go that far on a good conventional too.
 
On a good synthetic


The "perfect" one year OCI would be

500 miles a month. All highway. each trip on the highway being 1/2 hour long.

In 70 degree weather.
 
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I went 4k miles on syn in a known easy on the oil engine that saw short trips in a 7-8 month period.

The UOA came back terrible compared to a UOA that saw the same miles that were 1/2 trip and the rest city on conventional.

I'll never do a OCI past 6 months on ANY oil.

Take care, bill
 
Good operating temps meaning as little time as possible in an over rich state, very good air filter, very good oil filtration and occasional extended trips to clean and circulate a lot of oil.
 
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