extended oil change questions - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 12-30-2011, 02:19 PM Thread Starter
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extended oil change questions

i was just sitting and thinking about all the hoo haa of extended oil drain. i change my oil every 4500mi. at 1500 mi per month that costs me about $15/mo. if i were to extend to 9000mi, which is about where the trucks computer would put me, i would save about $7.50/mo. not impressive when you figure you spend over $50,000 on this equipment. i know that my oil is always fresh and protecting the engine. now the oil analysis argument comes in. this tells you when the oil is still functioning well. when it shows too much metal in the sample, it is already too late. no do-overs are allowed. either bearings or cylinder wall are already damaged. so what has this helped except to tell you that your engine is damaged.

2011 silverado lt, crewcab, short bed, 4X4, d-max/ allison
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post #2 of 4 (permalink) Old 12-30-2011, 04:59 PM
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Well your assuming that the catastrophic damage has been done prior to you noticing your elevated metal counts. If you have done UOAs over the long term you can get a sense of what is normal wear and if your normal iron levels are 15-20 ppm and then one OCI they jump up to 300 ppm...nothing has exploded yet but it can tell you trouble might on the way and you can investigate further. Typically with metal on metal failure there are other symptoms (burning oil, low compression, odd noises, etc etc).

The things that a UOA is valuable for is small things you might not be able to notice without it, like elevated fuel levels from leaky injectors or a spike in sodium levels from coolant contamination. Unless your overflow is empty, you really can't tell you have coolant in your oil until you have a very expensive milkshake in your crankcase.

I will say that UOAs aren't very cost effective for a light duty diesel since a typical UOA might cost 50-60% of an oil change, while on trucks with 30+ qt sump they make more sense.

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post #3 of 4 (permalink) Old 01-03-2012, 05:31 AM
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I drilled my oil drain plug and installed a pencil magnet. It sticks out about 1/2 inch and is in the plug about 3/8 inch. The magnet was .200, I drilled it to .195 in the vise dry and with it hot drove in the magnet. I have never found anything on it.
I change my oil spring and fall it is about 50% on the oil monitor. I use the best oil filter I can find, Bosch or AC Delco, and Shell Rotella 15/40 dyno oil.
I was taught that an oil change is the cheapest overhaul you engine will NOT need.
Just a thought!

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post #4 of 4 (permalink) Old 01-03-2012, 12:04 PM Thread Starter
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my oil monitor is about 50% at 4500 miles. i was also taught by my dad that fresh oil is a motors best friend.

2011 silverado lt, crewcab, short bed, 4X4, d-max/ allison
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