What Is Your Severe Service Schedule ?

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Hyundai Elantra manual states 3,750 miles with no mention of either conventional or synthetic . What does your automobile manual state for severe service OCI ? No OLM comes with the Elantra , so the dealer says the manual is the gospel and all driving shall be considered severe (if you get off the Interstate ...)
 
Mine says use the OLM. It doesn't give any generic mileages. I assume the OLM is calibrated for dino. I use synthetic and change with 25% OLM left.
 
http://www.machinerylubrication.com/Read/77/gm%27s-oil-life-system-improves-timing-of-oil-change
GM OLM programming.
Click on the links for graphs/charts.
Severe service can be below 2,000 miles.
This seems to be primarily from short trips/cold oil.
 
3 months 3,000 miles severe service for 1988 Ford E-150. I do 2 6 month OCI's a year, on occasion I've stretched it to 1 year OCI's. I use Synthetic oil in it. I fall under the severe service category according to the Owners Manual.

My 93 Aerostar IIRC has the same schedule for SS. I change the oil every 5,000 miles using conventional oil. It also falls under Ford's definition of SS according to the Owners Manual.
 
Originally Posted By: wallyuwl
Mine says use the OLM.

Mine does, too. My OLM is based on amount of fuel consumed only. If you operate the vehicle in a way that produces poor MPG/high fuel consumption (such as lots of idling, lots of cold starts, high speed driving, towing, etc.), this would shorten the OCI.

But the OLM is calibrated pretty high up there: it waits for 2375 liters of gasoline to be burned before it signals an oil change. So, if my MPG is 15, that means my OCI will be about 9,400 miles. If my MPG is 25, that means about 15,700 miles. I always change it by the time I get to 10k miles anyway.
 
Mazda CX7 5,000 & 7,500. Follow the manual at least till you get out of waraanty and then extend to 5,000 and get a used oil analysis.
 
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Buick: 3 months, 3000 miles. I change at 7500-10k miles on "full synthetic" since I'm putting on lots of highway miles up and down the hills here. 5w30 of whatever syn is in the stash.

Honda: Follow the OLM. It's rumored to be a very smart OLM system, calibrated for conventional oil. I'm running Mobil 1 0w-20 in there since it gets driven spiritedly immediately after starting. Fortunately it's doing about 90% highway right now.
 
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