Oil change recomendations.

[Gator]

I have a 2005 Dodge diesel, used dello 400 since new, next 3 changes will be mobil delvac 1300 (6$ a gallon at W-M.
The truck is driven daily 12 miles 1 way to work, sits all day then 12 miles back, on this diesel the truck never reaches full temp in any thing cooler than 40 degrees,the thermostat never opens, A winter front did not help and it has only gotten down to 30 degrees F here, this is bad on oil I no but I do get to go on a trip every weekend minimum 50 to 100 miles 1 way trip then back. I have been changing at 7,500 miles and using wix filters. I am changing to a new oil filter (Fleetguard LF9028) a venturi bypass filter, and will run this filter 15,000 miles before changing, Cost will be the same so this is not a cost savings idea. Do you guys think it would be better on the oil to continue doing a oil change at 7,500 miles, or would replacing a gallon of oil every 3,000 miles until it reaches 15,000 miles then replace it all. I no this is conventional oil but it seems the additives would be better replenished this way. The filter is a higher dollar filter but I got a good deal on a case from a friend who owns a fleet of trucks and the time to do the tinkering is no problem as I like messing with the truck.

Thanks


Sorry for the long post hard to explaing

 

[Paul2007]

If the question is to extend the OCI out to 15K, with conventional oil I'd vote no. Filtering is besides the point, a filter will not catch all the soot. The consumption of the additive pack (the viscosity modifiers), eventual fuel dilution, and soot buildup guides my thinking. Just my $.02.

 

[m37charlie]

If your driving pattern were different (longer trips, getting engine fully warm) were different, I would say the 1 gal/3K mi bypass change plan for 15K would be fine. However, with the short trips, be careful. Why don't you do a used oil analysis at 7.5K mi looking especially for soot and fuel. Then, if low, and viscosity still OK, extend to 15K. Doing the 3K mi 1 gal bypass change.

Charlie