Home » Public Forums » GMCnet » [GMCnet] Synthetic Oil
| [GMCnet] Synthetic Oil [message #72786] |
Thu, 04 February 2010 10:36  |
fbhtxak
Messages: 191
Registered: April 2006
Karma: 0
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Senior Member |
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For N9KB:
Ken,
While I have had only a few courses in tribology (i.e., the
science of lubrication), I fully agree with your
observations (i.e., "Why Change", synthetics/old engine
technology and ZDDP/old engine technology, etc.).
I am amazed, however, that you have to add only one quart in
6000 miles at 90k miles on the clock. The "403" in my coach
has, since new, always required about one quart in 800
miles. 'Now has about 105k mi. I rent cars rather than tow
and set the cruise at 70 mph where speed limits permit. Not
surprisingly, less make-up is required at lower speeds
(about one qt. in 1000 mi. at 55 MPH). Maybe "455" Olds
engines were just made to tighter clearance standards than
the "403s"...
The old Airstream (w/Chev "454") in Alaska has about the
same make-up requirements as the "403" when driven
similarly. 'Not many roads, however, in Alaska where the
cruise control can be set - and maintained at 70 mph.
"454s", though, never did have a good reputation on oil
consumption.
Fred Hudspeth
'78 Royale - Tyler, TX
'82 Airstream Excella 28' Motorhome - Anchorage, Alaska
Date: Wed, 03 Feb 2010 21:04:37 -0600
From: Ken Burton <n9cv@comcast.net>
Subject: Re: [GMCnet] Synthetic Oil
To: gmclist@temp.gmcnet.org
Message-ID: <11c39.4b6a3944@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
My question to you is WHY change? Whatever the coach has
been using got it 100,000 miles in 30 years. If you are
not having oil consumption or other problems I would leave
it alone.
Synthetics run OK in a tight engine. If the engine is using
oil forget the synthetics. My engine has only seen Rotella
Dino oil since it was new. The coach had 2 POs and both
used Rotella. I use one quart in 6000 miles and the coach
has just under 90,000 miles on it.
Do not worry too much about the ZDDP as that primarily
affects new cams and lifters. After a few thousand miles
the modern (since 2008) lower ZDDP oils do not seem to be a
problem. I stocked up on Rotella before the government
formulation change. Newer Rotella still has 2/3 of the ZDDP
as compared to prior to 2008.
JMHO.
Ken B.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Synthetic Oil [message #72868 is a reply to message #72786] |
Thu, 04 February 2010 23:25  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| fbhtxak wrote on Thu, 04 February 2010 10:36 |
For N9KB:
Ken,
While I have had only a few courses in tribology (i.e., the
science of lubrication), I fully agree with your
observations (i.e., "Why Change", synthetics/old engine
technology and ZDDP/old engine technology, etc.).
I am amazed, however, that you have to add only one quart in
6000 miles at 90k miles on the clock. The "403" in my coach
has, since new, always required about one quart in 800
miles. 'Now has about 105k mi. I rent cars rather than tow
and set the cruise at 70 mph where speed limits permit. Not
surprisingly, less make-up is required at lower speeds
(about one qt. in 1000 mi. at 55 MPH). Maybe "455" Olds
engines were just made to tighter clearance standards than
the "403s"...
The old Airstream (w/Chev "454") in Alaska has about the
same make-up requirements as the "403" when driven
similarly. 'Not many roads, however, in Alaska where the
cruise control can be set - and maintained at 70 mph.
"454s", though, never did have a good reputation on oil
consumption.
Fred Hudspeth
'78 Royale - Tyler, TX
'82 Airstream Excella 28' Motorhome - Anchorage, Alaska
Date: Wed, 03 Feb 2010 21:04:37 -0600
From: Ken Burton <n9cv@comcast.net>
Subject: Re: [GMCnet] Synthetic Oil
To: gmclist@temp.gmcnet.org
Message-ID: <11c39.4b6a3944@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
My question to you is WHY change? Whatever the coach has
been using got it 100,000 miles in 30 years. If you are
not having oil consumption or other problems I would leave
it alone.
Synthetics run OK in a tight engine. If the engine is using
oil forget the synthetics. My engine has only seen Rotella
Dino oil since it was new. The coach had 2 POs and both
used Rotella. I use one quart in 6000 miles and the coach
has just under 90,000 miles on it.
Do not worry too much about the ZDDP as that primarily
affects new cams and lifters. After a few thousand miles
the modern (since 2008) lower ZDDP oils do not seem to be a
problem. I stocked up on Rotella before the government
formulation change. Newer Rotella still has 2/3 of the ZDDP
as compared to prior to 2008.
JMHO.
|
Hi Fred.
Quit using those big words that I do not understand. TRIBOLOGY???
I am just reporting my oil consumption as it is. My cars are all the same way and I do not drive new cars. My 98 Blazer has around 170,000 on it, Laurie's 99 Jimmy has 100,000 on it. My daughters 96 Blazer has 280,000 on it and my 05 Colorado has around 80,000 on it. None of these use oil.
I believe if you use the proper weight high detergent oil with a decent filter and change it based on miles or annually, you should not have major engine wear problems. The only engine I have ever had problems with was a 2.8 liter V-6 in an S-10 that I ran Mobil 1 in since new. I wore a timing chain and gear to the point I had to change it at 40,000 and I had lifter problems starting at around 65,000 miles. GM refused the warranty clain based on the MObil 1 use. (Their warranty was only 36,000 and ther refused an special claim on this.) In 1991 I dumped that vehicle and bought another new one identical to it. This was the last new car I ever bought. I ran that 1991 truck until last year on Haveline 5w30 winter and 10w30 summer. I finally got rid of it because everything was badly rusted out. The fellow I sold it to wanted the 170,000 mile engine to put into another S-10. It also used no oil.
I run Havoline in my newer engines because Rotella does not make a 5w30 or 10W30 oil. I run Rotella dino 15w40 in my older looser tolerance gas engines and in my diesel tractor. I also run a 180 degree thermostat and an external oil cooler to keep the engine oil a little cooler. This keeps the oil is a little thicker. The 180 thermostat and trans oil cooler also helps the trans which is bolted directly to the engine run a little cooler. Dick Paterson recommends the 180 thermostat for the same reasons. Dick also made a comment in one of his seminars that I attended that he noticed reduced oil consumption when he switched to Rotella form Mobil 1 a few years back. He had no explanation for this.
That is my experience. What can I say?
Now if you want to talk about oil burners, lets talk about my airplane engine. I would be happy with 1000 miles to the quart on it. That is why we use ashless dispersant oil in an airplane. 1000 to 1200 miles on a quart is considered about the best you can get on an air cooled loosely built airplane engine. Note: We actually measure oil consumption in hours rather than miles on an airplane.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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