Re: Zdp

[Bill Blue]

i believe diesel oils don't have that much zdp in it now . the truck manufacturers started putting converters on trucks in 2003 . i bought several new internationals that year and the converter was built into the muffler . they had cat motors .i also bought new medium duty trucks with converters on them starting at that time .

This issue came up on Bob is the oil guy last fall. Shell provided them with a letter and oil analysis that showed that while the levels of the high pressure lubes had been reduced, they were still at a level that provides protection in Diesel engines.

Don't know how all this works out with the Diesel converter, perhaps it is a design that is not easily poisoned as its job is totally different than that of the gasoline engine converter.

Bill

 

[puff4]

There are catalytic converters (DPF-Diesel Particulate Filters) on diesel trucks now. They became necessary with the 2007 EPA standards for diesels.

I stand corrected. Thanks!

 

[Series6]

Accomodating the DPF's and all the exhaust configurations available with all the engine and cab & cab/sleeper configurations as well as the frame layouts on a Class 7 or 8 truck/tractor available........... it's a nightmare....

 

[RootesRacer]

Diesel engines have to be really tired before they burn oil like a gas job.

Even with a cat, zinc is not likely to foul it like with a gas system.

Reason is that they never make vacuum in the combustion chambers so oil usually isnt sucked through the guides, or past the compression ring.

Its turbo compressor oil seal failure that fouls diesel engines.

 

[Nickodell]

Strange how some subjects go on and on forever, and raise as many myths as anything else. Jose has it right: Synthetics give all and take away nothing. Just dope them with enough ZDP.

Hurrah! Nobody used the word WEIGHT!

 

[mackzknife]

Drawbacks?

Hi Mike,

I think any engine would benefit from using a Synthetic.

Jose

I've always been curious if there are any issues over changing to synthetic.

 

[puff4]

I've always been curious if there are any issues over changing to synthetic.

Well, as I say, I think that any engine which has new seals will do fine, provided you add ZDP to the synthetic (I use Mobil 1 in most of my cars). But if the seals are older, I strongly recommend against using a synthetic because it will almost surely turn it into a chronic oil leaker. (I speak from experience!)