Oil Change Interval Lengths for Synthetic

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Thread: Oil Change Interval Lengths for Synthetic

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    Oil Change Interval Lengths for Synthetic

    I'm currently sitting at 52K miles, and at 46K I changed the oil to AMSOIL with an A\C Delco filter. The oil life percentage is at 3% now. How far has anyone here gone on AMSOIL? Using their oil in my prior gas or diesel trucks, I'd routinely push 15,000 miles on one change, with nothing negative to show in the oil analysis results.
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    1st Gear BradHerr's Avatar
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    Oil Change Interval Lengths for Synthetic

    I am on Amsoil. I get the oil analyzed about every 13,000 miles. I am at about 30,000 miles on this oil. The last sample was still at level 1, which is the best rating. I change filters after a "good" sample reading.


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    The oil life monitor doesn't use the quality of the oil to determine the life. I have to reset mine when it starts giving the warnings.


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    Quote Originally Posted by BradHerr View Post
    The oil life monitor doesn't use the quality of the oil to determine the life. I have to reset mine when it starts giving the warnings.


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    Yes, either reset it or just clear the message upon start up and reset when you actually change it. If you have an active OnStar account a red X is marked on the miles whenever you reset it. It's apart of the online stats not shown in the mobile app.
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    After getting several oil analyses done, I determined that 15K miles is a good interval. I basically reset the OLM and run through it twice before I change oil. Still zero noticeable oil consumption close to 200K miles.
    BradHerr and magnusson like this.
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    Quote Originally Posted by BradHerr View Post
    I am on Amsoil. I get the oil analyzed about every 13,000 miles. I am at about 30,000 miles on this oil. The last sample was still at level 1, which is the best rating. I change filters after a "good" sample reading.


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    Interesting. When I got my oil tested, the tests showed some abrasion after about 18K miles, that was why I backed down to 15K.

    Here's where I posted details:

    Oil Testing Anayslis for Diesels
    2014 Chevy Cruze Clean Turbo Diesel 196K (Domenic - On the way to 200K!), 1986 Mercedes 300E 5 Speed odo broken (Rammstein - Sold and then repurchased), 2017 Honda Civic Sport Hatchback 6M 5K (Gordon - my backup car until the new 1.6 diesels come out)

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    Totally agree on the oil life indicator. It does provide a useful tool to see how you are driving over the past few thousand miles though.

    30k is definitely the longest I've heard of. I may just get it tested now and then see what they say. Would love to push it out that far, if the oil holds up.

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    I usually run my Mobil 1/AC Delco filter on the Cobalt to about 10,000 miles - but this being a diesel/direct injection, who knows.

    I've been wanting to switch to synthetic here for a bit, but haven't had the time to take care of changing the oil on this car myself (since I'll have to "learn" a new car), so I've been having the dealer do it - also because they do it for so cheap ($40 for Dexos2).
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    It depends is the best answer....With a lot of short tripping/idling/interrupted regens fuel dilution will get you.

    The people going with the big intervals are putting on real miles.

    7,500mi is my max confirmed with UOA because of fuel dilution due to my driving habits.
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    Quote Originally Posted by diesel View Post
    Interesting. When I got my oil tested, the tests showed some abrasion after about 18K miles, that was why I backed down to 15K.

    Here's where I posted details:

    Oil Testing Anayslis for Diesels
    Bear in mind we have people going MUCH longer on diesel oils in other diesel engines than even 18k. I wonder if that analysis report was an outlier. Just saying; if the filtration is up to par, and the oil didn't oxidize, you should be good to go.

    Quote Originally Posted by KpaxFAQ View Post
    It depends is the best answer....With a lot of short tripping/idling/interrupted regens fuel dilution will get you.

    The people going with the big intervals are putting on real miles.

    7,500mi is my max confirmed with UOA because of fuel dilution due to my driving habits.
    We see very high levels of fuel dilution in big rigs and other light diesel trucks. It never really leaves any cause for concern unless it gets above around 5%. As long as the wear metals are low, you won't have a problem. Your fuel dilution is likely setting in very early; I'll bet you'd see significant fuel dilution even at half that interval.

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