Why hasn't API 'SJ' been withdrawn?

[addyguy]

They've updated the API chart.....GF-4 is obsolete, replaced by GF-5. On the diesel side, API CF-2 and CG-4 have been withdrawn, now just CH-4, CI-4, and CJ-4.

But, on the 'gas' side, nothing has changed - API SJ, SL, SM, and now SN are all current. I thought with the move to SN, SJ would become obsolete, and you'd have 3 gas specs, like the 3 diesel specs.

 

[HangerHarley]

RP still has an SJ oil and perhaps its still around for older cars?

 

[Hemi426]

My WM still has Accel SF oil for 1988 and older cars.

 

[Boomer]

Some older lawn equipment calls for SJ.

 

[HTSS_TR]

My '94 LS400 recommends SG or SH, SJ was not available before 1995.

 

[kcfx4]

Originally Posted By: Boomer
Some older lawn equipment calls for SJ.

good point!

 

[chevrofreak]

Most motorcycle oils are SJ.

 

[addyguy]

So, chances are, SJ might stay around for a bit? Just weird that other specs are deleted pretty quickly as others come along, but they can't seem to get rid of SJ......

 

[BrianWC]

I have some SJ synth Pennzoil in my stash I still use.

 

[HangerHarley]

Originally Posted By: addyguy
So, chances are, SJ might stay around for a bit? Just weird that other specs are deleted pretty quickly as others come along, but they can't seem to get rid of SJ......


"If it aint broke dont fix it."

Do we need to reignite the whole ZDDP levels thing? (What is approved stance on that one?)

 

[mrkdk]

Originally Posted By: Boomer
Some older lawn equipment calls for SJ.

 

[flatlandtacoma]

Originally Posted By: addyguy
They've updated the API chart.....GF-4 is obsolete, replaced by GF-5. On the diesel side, API CF-2 and CG-4 have been withdrawn, now just CH-4, CI-4, and CJ-4.

But, on the 'gas' side, nothing has changed - API SJ, SL, SM, and now SN are all current. I thought with the move to SN, SJ would become obsolete, and you'd have 3 gas specs, like the 3 diesel specs.


I don't think there is anything magical about "3 specs". CJ-4 was out for a while before licensing of CF, CF-2, and CG-4 was discontinued.

On the API website it states that the CF-2 licensing was discontinued after one of the engine tests used to document CF-2 performance was no longer available.