Oil Change Frequency?
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Man, I gotta say that I'm disappointed here. I thought for sure somebody with a bypass filtration system would have jumped on this to extoll the virtues of those systems and tout some extended change interval. Guess that gives me something to think about too. I have a hard time racking up 5k in a year. I usually force myself to change it at least 2x a year despite that.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
I have a bypass, but with just 3000 miles on the bypass and new oil, I don't have much of a word on extended change intervals. I did however just get my first UOA, with the 3000 miles on the oil, back from Blackstone today, and everything looked great. They noted that the insolubles (oil oxidation and soot due to heat, use, and blow-by) were quite low at just 0.3%, which showed good oil filtration. They feel that I could easily run longer oil before an oil change. I also had a TBN done, and it was still at 9.9. This was on Mobil 1 5W40 Truck and SUV oil - not my favorite, but it's what was available when I did my last oil change. I'll get another UOA done in 3000 more miles. That may be more than required, but since it's my first shot at it, I'm curious.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
JT, I thought a bypass system was good for at least doubling the service life of oil. Since you're running synthetic I would think it could be more.
On edit: Where's Nut at with his TP system? I've heard good things from those too.
On edit: Where's Nut at with his TP system? I've heard good things from those too.
Last edited by Tenn01PSD350; May 2, 2006 at 12:08 AM.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
I think it will at least double the service life. But, since it's the first shot at bypass oil filters, I'm taking caution. And, like I said, the oil isn't my favorite. My goal is to hit 7500 miles then switch oils and check the results on that.
Senior User
Joined: May 2002
Posts: 301
Likes: 1
From: East Texas
I've tested last three oil changes 5000 mi and twice @ 6000 mi. all is good, going to 7000 this mo and 1000 every month after that till I get a report that say's to change it. always changed it at 3000 mi for most of the 149,000 miles that it has. no mod's or harsh driving habits. apx 20,000 of the miles had a by-pass filter system that sounded great untill i got a report back that was bad, oil had 13,000 at testing. no longer trust by pass systems for extended oil changes unless tested every 3000 mi."there's no saving's in that"
gseeders
gseeders
Last edited by gseeders; May 2, 2006 at 10:32 AM.
New User
Joined: Jan 2006
Posts: 14
Likes: 0
Cellulose is the best oil filter known to man. A tightly wound roll of TP is nothing more than high quality cellulose. I stopped draining oil over 40 years ago. The only time I drain oil is if I have some type of problem such as a Leaky head gasket. It has always worked for me. My oldest bypass filter still in use is a Motor Guard M-100. It is over 35 years old and has paid for itself many times over. It is a compressing type filter which means there is very little free oil to spill out. The trick is to use only submicronic bypass filters. Don't waste time with bypass filters that are only a little better than a full flow filter.
Ralph
Ralph
Postmaster
Joined: Jun 2005
Posts: 3,438
Likes: 0
From: New Hampshire
Originally Posted by Tenn01PSD350
JT, I thought a bypass system was good for at least doubling the service life of oil. Since you're running synthetic I would think it could be more.
On edit: Where's Nut at with his TP system? I've heard good things from those too.
On edit: Where's Nut at with his TP system? I've heard good things from those too.
Was just on vacation. Like Ralph says the TP filters do the job well. My dual MG-30's keep my oil pretty clean. Going to change rolls today.
Nut
Elder User
Joined: Aug 2003
Posts: 568
Likes: 1
From: Kansas
Changing every 5k...Mobile Delvac 1300 15/40. At 5k, oil is black enough to make me wonder why anyone would wait any longer...just my .02. Fuel filter every 10k
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New User
Joined: Jan 2006
Posts: 14
Likes: 0
Bypass Oil Filters
Originally Posted by PSNut
Hey Tenn,
Was just on vacation. Like Ralph says the TP filters do the job well. My dual MG-30's keep my oil pretty clean. Going to change rolls today.
Nut
Was just on vacation. Like Ralph says the TP filters do the job well. My dual MG-30's keep my oil pretty clean. Going to change rolls today.
Nut
Ralph
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
Originally Posted by trakman
Changing every 5k...Mobile Delvac 1300 15/40. At 5k, oil is black enough to make me wonder why anyone would wait any longer...just my .02. Fuel filter every 10k
Elder User
Joined: Oct 2005
Posts: 786
Likes: 0
From: Reno nv
my $.02:
TP filters DO keep the crud out, but do nothing for replacing any of the life extending aditives. Then there is the question of sulphur in the fuel becomming sulphuric acid in the crankcase. Oil also oxidizes becomming varnish and sludge, which may or may not become part of the filtering process to keep it out. Then there is the whole arguement about keeping sub-microscopic abrasive materials in suspension that can't be done when the oil is full of OTHER sub-micro's
If you aquire additives and add them frequently then perhaps extended is the way to go.
I myself am a confirmed 3000 mile changer. 22 times @ 65K miles costing about 600.00 so far.
TP filters DO keep the crud out, but do nothing for replacing any of the life extending aditives. Then there is the question of sulphur in the fuel becomming sulphuric acid in the crankcase. Oil also oxidizes becomming varnish and sludge, which may or may not become part of the filtering process to keep it out. Then there is the whole arguement about keeping sub-microscopic abrasive materials in suspension that can't be done when the oil is full of OTHER sub-micro's
If you aquire additives and add them frequently then perhaps extended is the way to go.
I myself am a confirmed 3000 mile changer. 22 times @ 65K miles costing about 600.00 so far.
Postmaster
Joined: Jun 2005
Posts: 3,438
Likes: 0
From: New Hampshire
Originally Posted by piotrsko
my $.02:
TP filters DO keep the crud out, but do nothing for replacing any of the life extending aditives. Then there is the question of sulphur in the fuel becomming sulphuric acid in the crankcase. Oil also oxidizes becomming varnish and sludge, which may or may not become part of the filtering process to keep it out. Then there is the whole arguement about keeping sub-microscopic abrasive materials in suspension that can't be done when the oil is full of OTHER sub-micro's
If you aquire additives and add them frequently then perhaps extended is the way to go.
I myself am a confirmed 3000 mile changer. 22 times @ 65K miles costing about 600.00 so far.
TP filters DO keep the crud out, but do nothing for replacing any of the life extending aditives. Then there is the question of sulphur in the fuel becomming sulphuric acid in the crankcase. Oil also oxidizes becomming varnish and sludge, which may or may not become part of the filtering process to keep it out. Then there is the whole arguement about keeping sub-microscopic abrasive materials in suspension that can't be done when the oil is full of OTHER sub-micro's
If you aquire additives and add them frequently then perhaps extended is the way to go.
I myself am a confirmed 3000 mile changer. 22 times @ 65K miles costing about 600.00 so far.
The additives are replenished when u replace the filter element with make up oil(usually about 1-2qts). Lubecontrol also makes an additive that aids the oil additives in doing their job. My .02 worth.
Nut
Senior User
Joined: Aug 2001
Posts: 300
Likes: 0
From: Kentucky
I have changed my oil at 3500 the first 3 times, then went to 5000 for a couple, since then every 7500 miles. It has always had Rotella 15-40 with filter change each time. Now has 161+k miles on and uses no oil and runs like scalded cat. (that's fairly fast). I also keep Marvel Mystery oil in the fuel every 30 gal/4-5 oz.
Absolutely NO problems in above miles, except for one CMP replaced under warrantyat 80k.
Bill in KY
Absolutely NO problems in above miles, except for one CMP replaced under warrantyat 80k.
Bill in KY
Postmaster
Joined: Jun 2005
Posts: 3,438
Likes: 0
From: New Hampshire
Originally Posted by hodgekuter
I have changed my oil at 3500 the first 3 times, then went to 5000 for a couple, since then every 7500 miles. It has always had Rotella 15-40 with filter change each time. Now has 161+k miles on and uses no oil and runs like scalded cat. (that's fairly fast). I also keep Marvel Mystery oil in the fuel every 30 gal/4-5 oz.
Absolutely NO problems in above miles, except for one CMP replaced under warrantyat 80k.
Bill in KY
Absolutely NO problems in above miles, except for one CMP replaced under warrantyat 80k.
Bill in KY
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