I have heard good and bad comments about using Delvac1 in my 2004 gas powered superchared chevy truck. Something about zddp(zink)which is an anti wear additive can cause damaged to my cat converters. The containers says can be used in both gas or diesel applications. I would appreciate some others opinion and thoughts on this.
Using Delvac1 in a gas powered supercharged Chevy
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Well, the oil itself is bulletproof. I've used it in my jeep engines ..and if it was still available at the 5 quart T&SUV price ..they still would be. At about $30/gallon ..it's just too rich for my blood ..even over my extended drains.
There's lots of bona fide evidence that zddp is a volatilized component that degrades cats. That has to be indexed properly. If you're changing oil with lesser content of zddp in it ..more often ..then you're introducing perhaps MORE zddp in total (if you see what I mean).
I still don't think you're going to see issues, if any, until the 150k/10year range of things.
There's lots of bona fide evidence that zddp is a volatilized component that degrades cats. That has to be indexed properly. If you're changing oil with lesser content of zddp in it ..more often ..then you're introducing perhaps MORE zddp in total (if you see what I mean).
I still don't think you're going to see issues, if any, until the 150k/10year range of things.
IMHO you are fine Unless you burn 1 quart per 500 miles I do not think over the life of the truck you will have a problem I have 200K on my bronco all with HDEO and still passes smog.
bruce
bruce
Gary has an excellent grasp of the issues at hand. Much of the confusion related to this topic is that people talk of vehicles as a whole. There are differences between emission standards depending on the vehicle, and thus, the impact of any phosphorus poisoning from high ZDDP levels degrading your catalytic converter.
Here's some dated references, but provides a good background:
http://www.ucsusa.org/clean_vehicles/veh...-standards.html
http://www.ucsusa.org/assets/documents/clean_vehicles/schedules.pdf
You'll see people state, "I've run HDEO in my vehicle for 200,000 miles, and it still passes emissions tests." However, what might not be stated is that they have Federal Tier 1 Standard light duty truck, which doesn't have to pass anywhere near a stringent emissions test as say a brand new 2007 Federal Tier 2 standard car. Also keep in mind that identical cars' catalytic converters will also degrade differently due to other factors.
To cut to the chase, if you have a vehicle that is a 2003 or older, odds favor you not degrading your catalytic converter to the point where it has to be replaced while you own it. Tree huggers might object...but?
However, given the above, I don't feel comfortable with giving blanket recommendations for use of HDEOs, since some people with brand new 2007 Federal Tier 2 cars might assume it's OK to use them too, and no one here knows what a lifetime of high ZDDP level oils will do to the emission passability of these vehicles.
As an addendum, diesel engines starting this model year have to pass more stringent emission standards, and to help them achieve that, low SAPS (Sulphated Ash, Phosphorus, Sulphur) HDEOs are being introduced. These HDEOs would be the one's I would recommend if one insisted on using HDEOs in a vehicle not required to use them.
Delvac1 would be a good call in my opinion. The viscosity will help with the increased bearing loading from the supercharging, depending on how you drive. I haven't had any problem with emissions using HDEOs on an engine burning about a quart every 3K. Check Delvac! ZDDP levels against "regular" oils in the VOA section.
You could also try something like Castrol 0W-30, a thick 30 grade or several Amsoil products.
You could also try something like Castrol 0W-30, a thick 30 grade or several Amsoil products.
Here's the story with ZDDP. ZDDP has been used for years by most every oil company to protect valve trains and the cylinder at Top Dead and Bottom Dead. Also, there have been oxygen sensors and catalytic convertors on most cars for years. The two have been existing for years...
But when some of the engine oil gets into the combustion chamber, the ZDDP may get combusted and turn to ash. The phosphorus and sulfur ash from the ZDDP can get into the pores of the oxygen sensor OVER TIME and make it sluggish. Likewise, the ash gets into the pores of the front of the catalytic converter OVER TIME and plugs pores that would otherwise be reducing emissions.
Reducing the ZDDP means that the emission controls should see less ash.
But when some of the engine oil gets into the combustion chamber, the ZDDP may get combusted and turn to ash. The phosphorus and sulfur ash from the ZDDP can get into the pores of the oxygen sensor OVER TIME and make it sluggish. Likewise, the ash gets into the pores of the front of the catalytic converter OVER TIME and plugs pores that would otherwise be reducing emissions.
Reducing the ZDDP means that the emission controls should see less ash.
It's not moderate oil consumption that's the major contributor to phosphorus poisoning, it's the volatile phosphorus components.
For a more complete understanding:
http://herkules.oulu.fi/isbn9514269543/isbn9514269543.pdf
http://www.swri.org/dasl/n-tcd/dasl_n-tcdb4.pdf
http://www.eere.energy.gov/afdc/pdfs/32842.pdf
http://www.savantgroup.com/ASTMSym04-PEI.pdf
http://www.swri.edu/3pubs/ttoday/Winter04/Focas.htm
http://repairnet.aircare.ca/documentation/newsletterpdfs/2005-1.pdf (page 7)
What engine is this? Is it a stock or aftermarket supercharger? Virtually all GM engines had rollerized valvetrains in 2004, and the V8s have G-rotor oil pumps driven by the crankshaft, and no camshaft driven distributors, thus high levels of ZDDP aren't required to prevent wear in the valvetrain. A solid synthetic would be my recommendation, something like GC 0w30, M1 0w40, M1 10w30 EP or equivalent.
At 20,000 miles I added an after market super charger. The same type found on Ford Lightnings. I installed headers,flow master exhaust and a K&N filter. Transmission didnt like the super charger. Had to install a shift kit. Next stock tires went up in smoke if I jump to WOT at a stand still. I installed Helo max6 18inch rims with Toyo 285/60/18 which gives me a good bite. Installed a high volume fuel pump .
Why am I running this oil ? I got it for a song and bought 14 gallons of this stuff. I got scared as GM said I should not use it but Mobil said it was ok. I voided the warranty with installing the super charger Then I read about this oil having 4 times the amount of zink in it and it would harm the cats and I lost sleep.
I hope I do not have to change out my cat converters but it sounds like the posting says it should be ok ?
Why am I running this oil ? I got it for a song and bought 14 gallons of this stuff. I got scared as GM said I should not use it but Mobil said it was ok. I voided the warranty with installing the super charger Then I read about this oil having 4 times the amount of zink in it and it would harm the cats and I lost sleep.
I hope I do not have to change out my cat converters but it sounds like the posting says it should be ok ?
I am changing the oil 6,000 instead of 15k. I just can't go that distance. All my life the 3k has been drummed into to me and if I mention going over 3k my friends act as though I am killing my engine.
Any thoughts on Walmart Super Tech synthetic ?
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I stopped counting your aftermarket alterations at about $5 grand .....
..and you're worried about the cost of cats in the future? Is your supercharger CARB or 50 state certified? You smoked the OEM tires and replaced them with a full set of wheels and fancier tires? Cats are still an issue? I'd worry about overhauling the engine if you enjoy it too much. The money leaking out of your wallet will cover new cats several times over.
That being said .....
Essentially 427 is saying that cat degradation occurs due to these additives. The amount of degradation will vary from vehicle to vehicle just as wear does. Using oils heavier in the toxic additives will increase this degradation however great or little that may be. Whether it effects your engine/cat setup to the point of failure is unknow, just as how much wear you're going to see over your ownership due to the "usage variable". The standards that constitute failure are probably tightened the newer the vehicle is.
Quote:
I stopped counting your aftermarket alterations at about $5 grand .....
..and you're worried about the cost of cats in the future? Is your supercharger CARB or 50 state certified? You smoked the OEM tires and replaced them with a full set of wheels and fancier tires? Cats are still an issue? I'd worry about overhauling the engine if you enjoy it too much. The money leaking out of your wallet will cover new cats several times over.
I can't argue with this logic. If you already have the Delvac 1, use it.
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