Engine Hours per OCI

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I just changed the oil in my Ram 1500 5.7L eTorque after 9 months and 4,954 miles. This interval was a mix of city and highway driving, but probably 50-60% city. According to the trip computer this worked out to 186 engine hours. Oil life Monitor was in the 40-ish percent remaining.

I recognize that some farm equipment and small engines specify oil changes at 200 hour intervals. At least for my use, it appears that a 5K interval gets me pretty close to that!
 
I just changed the oil in my Ram 1500 5.7L eTorque after 9 months and 4,954 miles. This interval was a mix of city and highway driving, but probably 50-60% city. According to the trip computer this worked out to 186 engine hours. Oil life Monitor was in the 40-ish percent remaining.
So you were averaging 4954/186 = 27 mph. Sounds like lots of around town driving.

I recognize that some farm equipment and small engines specify oil changes at 200 hour intervals. At least for my use, it appears that a 5K interval gets me pretty close to that!
My Mazda3 recommends OCI of 5000 miles for hard service, 7500 miles for mostly freeway driving. If we assume 30 mph average and 60 mph average accordingly, that's 166 hours and 125 hours respectively.
 
My Mazda CX-50 had 240 hours and 8684 miles for my first oil change. 29 of those hours were idling and the OLM was saying I had another 1500 miles to go. So my average speed was ~36mph. So if I would have ran the OLM out, I would have been at about 280 hours for my oil change interval in hours. That seems pretty reasonable to me.
 
I normally go 5,000-6,000 km on an oil change during the summer. I go down to 4,000 km in the winter to account for the extra time spent idling and warming up.
 
Took this shot of my dash monitor in the 2500.
Mostly towing,.a few home depot runs.
4k and 20 months on the HPL.
IMG_20231213_104200574.jpg
 
My Durango today has 31,500 miles on the oil and by my best estimate about 800 hours. The truck, a 2021 Chevy Duramax, has 22,000 miles and 508 hours on the oil. Both vehicles have averaged around 40MPH.
What oil are both engines running?
 
The last three oil changes have averaged 137.65 hours w/7,185 miles avg. But w/the other data I've concluded that 106,615 miles on the truck it's averaged around 140.612441729 hours per oil change.
 
None of the vehicles in the family have an hour meter, so I go by time and mileage.

I'm still intrigued by a post here a year or two ago which proposed that fuel volume consumed was inversely proportional to oil life.

I think the formula was:

Change oil once volume of fuel consumed = volume of motor oil x 200.

This formula is simple yet elegant, in that it compensates for cold starts, idling, cold weather, stop-and-go traffic, headwinds, etc. - all of which lead to higher fuel consumption.

For our '97 Dodge Grand Caravan 3.3:

Winter driving - averaging about 18l/100 km so far (rather than 20 last winter), due to a milder-than-usual average winter and garaging the van more often.

4.7 l sump x 200 = 940 litres of fuel

How many km to use 940 l of fuel?

940 litres/18 litres/100 km = 5222 km.

That sounds low to me - I wonder how many hours that would be.
 
I change them every 250hrs, don't track mileage as it might run 10hrs in a day but not even move.

My work truck has about 23,000 miles but almost 12,000 hours. The other one is at 1500hrs with 7000 miles
 
Over my history with the truck:
9958 miles - 352 hrs - 28.3 mph
10073 miles - 285 hrs - 35.3 mph
9972 miles - 285 hrs - 35 mph
9797 miles - 296 hrs - 33.1 mph
10147 miles - 270 hrs - 37.6 mph
9709 miles - 262 hrs - 37.1 mph

Lifetimes:
76161 miles - 2363 hrs - 32.2 mph (The average before I got it at 8800miles tells me it idled a TON)

None of the vehicles in the family have an hour meter, so I go by time and mileage.

I'm still intrigued by a post here a year or two ago which proposed that fuel volume consumed was inversely proportional to oil life.

I think the formula was:

Change oil once volume of fuel consumed = volume of motor oil x 200.

This formula is simple yet elegant, in that it compensates for cold starts, idling, cold weather, stop-and-go traffic, headwinds, etc. - all of which lead to higher fuel consumption.

For our '97 Dodge Grand Caravan 3.3:

Winter driving - averaging about 18l/100 km so far (rather than 20 last winter), due to a milder-than-usual average winter and garaging the van more often.

4.7 l sump x 200 = 940 litres of fuel

How many km to use 940 l of fuel?

940 litres/18 litres/100 km = 5222 km.

That sounds low to me - I wonder how many hours that would be.

18L/100km is atrocious. It must idle like crazy.

I just did my information and it came out to 11452km or 7116 miles. At my current average speed, that's about 192 hours. I could see that being applicable for a conventional oil in my driving situation. I've been having good results with 10k changes with synthetics.
 
Over my history with the truck:
9958 miles - 352 hrs - 28.3 mph
10073 miles - 285 hrs - 35.3 mph
9972 miles - 285 hrs - 35 mph
9797 miles - 296 hrs - 33.1 mph
10147 miles - 270 hrs - 37.6 mph
9709 miles - 262 hrs - 37.1 mph

Lifetimes:
76161 miles - 2363 hrs - 32.2 mph (The average before I got it at 8800miles tells me it idled a TON)



18L/100km is atrocious. It must idle like crazy.

I just did my information and it came out to 11452km or 7116 miles. At my current average speed, that's about 192 hours. I could see that being applicable for a conventional oil in my driving situation. I've been having good results with 10k changes with synthetics.
One issue here is construction, which results in lots of delays and thus a slower average speed.

The van turns in reasonable mileage on highway trips, and in city driving when the roads aren't too busy, making me think that it's OK mechanically.

Highway - 9 to 10 l/100 km (28 to 30 MPG Imperial, 23 to 24 MPG US).

My last work truck (2013 Chevy Silverado 2500 4x4 6.0 l has) had an OLM which typically ran down to 10% at about 10,000 km (6000 miles).
 
I just changed the oil in my Ram 1500 5.7L eTorque after 9 months and 4,954 miles. This interval was a mix of city and highway driving, but probably 50-60% city. According to the trip computer this worked out to 186 engine hours. Oil life Monitor was in the 40-ish percent remaining.

I recognize that some farm equipment and small engines specify oil changes at 200 hour intervals. At least for my use, it appears that a 5K interval gets me pretty close to that!
The John Deere equipment I worked on had a 500 hour service interval. Everyone agreed that was too much and decided to cut it in 1/2 to 250. Even @ 250 hrs the air filters and fuel filters required changing.
 
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