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Recommended oil change interval.

Not sure if we have been over doing the oil changes... We have been doing them when we hit 25-35,000 miles... But listening to your show we hear folks changing oil at MUCH larger intervals... Are we wasting money by doing them so often?? What is the recommended interval?

2012 Freightliner Cascadia... No modifications...DD15

Thanks in advance for your answers...

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The DD15 comes with oil bypass filtartion so just start sampling regularly and you'll know when/if to change you oil. You might not need an additional bypass system at all.

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On the DD15 the recommended oil change interval from the factory is 50,000 miles. So yes your changing to oftern according to that.

Personally I think oil change intervals are a personal preference. I have a by pass oil filter yet I still change my oil every 20,000 miles or so. I just use the by pass oil filter for better filtration.

Now with that being said you can install a by pass oil filter like the OPS and then take regular oil samples and the samples will tell you when its time to change your oil. Many people go well over 100,000 miles on their oil using this method.

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Thanks Jackie, I've just bought my first Truck, a Freightliner Cascadia with a DD-13. Would it have a different schedule from the DD15?

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I use Mobil One Synthetic 5W40 with no bypass and I change my oil around every 100,000 miles and I do mid-service filter changes and lube chassis around every 20,000 with an oil analysis to check oil quality @ Speedco that has been good to date.

I love the additional fuel economy of synthetic motor oil with easy starts on those cold mornings and know my motor is protected from one of the best oils on the market. You don't need additives with synthetic motor oil either.

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I've been looking for the right engine oil. Pre EGR series 60 at 460,000 miles, I'm thinking about giving the mobile one synthetic a shot. Any feedback/advice is appreciated.

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If you want longer oil change intervals add by-pass filter and let the oil analysis tell you went to change it.

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Forget the full synthetic, go with a syn blend. Best value going. Mobil Delvac Elite 10w30 is a great syn blend. I have seen some very stellar used oil sample reports on this stuff. Holds viscosity very well. All the engine OEM's are factory filling with 10w30 now. I am partial to Schaeffer 10w30 syn blend I use in my remanned Detroit 60, but the Mobil Delvac Elite 10w30 would be my second choice without reservation. Both have very good levels of moly in the add pack, which is a excellent, proven friction reducer, and good levels of zinc and phosphorus (excellent extreme pressure protectants), and good levels of detergency.

Used oil sample reading is as much an art form as a science. The key is tracking the trend lines over time. For my S60, I get good, steady data numbers till around 22,500. Wear numbers follow a study trend, TBN depletion follows a study trend, viscosity fluctuations stay study, etc. Above that, and the numbers deviate from the trend. The oil is still good, technically, but various numbers are starting to go outside the study trend. So I settle on 22,500 miles / 450 hrs as my OCI limit. I use bypass (FS2500) for keeping soot down, but bypass will not filter wear particulates nor slow TBN depletion or prevent viscosity changes due to shearing and such. Each engine, even within the same brand and model, will be different. One has to get good, solid sample data over time to make a determination what they can do.

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Many thanks Cliff

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Cliff, I was thinking about adding a gallon of Schaeffers Moly EP each oil change to rotella 15-40 and trying to go 20k. Your thoughts?

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Not a bad idea. Is there something that you feel Rotella is not taking care of?

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Not really, just like the idea of the Moly EP and taking the oil to 20k. Thanks for your input.

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Robert, is there any reason to not take the oil change to 20K or even more, even without the Moly EP? I take my 60 from 22.5K to 25K per oil change. Haven't found any reason to not do so. I get a slight spike on the oil samples that deviate from the trend line if I go over 25K, but nothing major. So I have settled on what I am doing. I am not sure anyone couldn't do the same with the oils we have available today, without any additive of any kind.

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Check your owner's manual. IIRC Kevin was talking about either 50 or 75k intervals on the DD15. If you don't have a manual call a Detroit shop or a Freightliner dealer.

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I ran my "99" International 800,000 without changing oil.It had 470 Detriot,with Harvard bypass filter and Conklin simi synthetic oil.Did oil analysis.Also had Fass system.

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What oil did you use. Pre EGR 12.7 DD S60 here too, looking for recommendations.

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I see a lot of talk on oil bypass use and only see ops1 discussed. Am I on an ops website? Has anyone used the gulf coast filter? Any bad reviews?

Also the Freightliner interval is 50k for oil change? I'm about to purchase a 13 cascadia and that's why I came here. I was going to change at 20-30k miles. Should I switch to synthetic or stick with what's in there? This truck will be running teams and rarely shut down outside maintenance.

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Yes. No need to ever change your oil. Put on an ops-1 system then just sample your oil and change the ops filter every 25k and the stock filter every 100k.

That is what I do on all my trucks .....except the sampling part , I never sample anything. If the engine is running - the oil is working.

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No need to ever change the oil...that might just be the worst advice ever. That's what sampling is for. Without sampling you don't know if there's any base left in it or what the viscosity is. Not to mention wear metals, water or fuel contamination. Just asking for internal component failure.

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