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Old 06-28-2015, 01:46 PM   #11
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Fully agreeing with Nat on this one.
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Old 06-28-2015, 05:34 PM   #12
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Dang it Nat,
i was already at napa when you posted and i got the rotella synthetic 5-40.
says cummins approved on the back, but i do recall switching my ex wifes high mileage car to synthetic and it turned that car into an oil burner. switched back and everything was fine.

so i will see. the synthetic was on sale, only 5$/gallon difference over the regular 15-40.

changed the oil filter, spin on transmission filter, fuel filter, and the big ole air filter. there is a fuel water separator down in the frame rail, like mentioned earlier, i just drained off the water, and let it be.
the genny had a couple of filters and got new oil too.
$150 in filters, $120 in oil.
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Old 06-28-2015, 09:13 PM   #13
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Synthetics will not do a thing as far as making your engine run smoother or quieter. Like other posters have said, it is cost prohibitive for your engine. I would however recommend any quality synthetic in your rear end and trans. In my opinion, Amsoil is no better or worse than any other brand, just more expensive, it's a marketing gimmick. Our over-the-road trucks go 50,000 miles between oil changes using standard motor oil.
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Old 06-28-2015, 10:32 PM   #14
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Our over-the-road trucks go 50,000 miles between oil changes using standard motor oil.
Wow! How do your big rigs get that much mileage between oil changes?
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Old 06-28-2015, 10:54 PM   #15
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Wow! How do your big rigs get that much mileage between oil changes?

My guess, bypass oil filter, oil filter changes and oil analysis.

And probably oil capacity of 12-15 gallons.
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Old 06-28-2015, 11:41 PM   #16
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I just read up on bypass oil filtration. When I first saw the word "bypass" I pictured oil bypassing the lone oil filter but in reality a bypass system uses two filters, one that uses a normal oil filter and another, much finer filter that bypasses the normal filter and also removes water and other contaminants that a normal oil filter doesn't remove.

Many gallons of oil doesn't hurt either.

One other question - I was told that the viscosity modifiers in multi-grade oils eventually wear out making them much thinner. Doesn't that happen to high mileage oils?
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Old 06-29-2015, 03:51 AM   #17
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One other question - I was told that the viscosity modifiers in multi-grade oils eventually wear out making them much thinner. Doesn't that happen to high mileage oils?
Non synthetic oil, yes.

If it's synthetic oil than they claim no. But I feel the additives would still wear out even in the synthetic oil, even if the oil it's self holds up better.

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Old 06-29-2015, 07:10 AM   #18
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In really BIG applications, the oil is monitored on a schedule, and the additives are added back as needed.
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Old 06-29-2015, 08:17 AM   #19
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nice questions.....

here is one.... what about teflon? ptfe?
ive seen other swear by its use in diesels or any engine.
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Old 06-29-2015, 06:37 PM   #20
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Wow! How do your big rigs get that much mileage between oil changes?
Easiest job in the world: Large displacement engine, 15-16 liters, lazing along a 1,200 rpm for hours on end. We take oil sample at every service. As long as the oil meets engine manufacturer's specs, it will stay at 50K.

The trucks with smaller engines that do more pick-up and delivery type work get changed sooner, 7-13 Liter engines. The smaller the engine, the harder it has to work.

BTW, we use no special filters or additives. Most engine filters, these days are a combination full flow/by-pass. Any add on filters are snake oil in my book.
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