NO ZINK IN THE MOBILE 1 OIL ANYMORE

[TommyL]

Interesting topic. I would still like to know about Royal Purple oil, does it have the Zink needed for older cars? Is there a good additive one can add to an oil change? What is one to do if the newer oil isnt good for older cars? (could be an expensive lesson) I will be changing the oil in both my Zs in the spring and would like to know the best oil to use. I have a rather large supply of M1 super syn 10w30 that I purchased on sale about a year ago and I am thinking there maybe some better blood for the LT-5. I have used M1 for about 10 years now and haven't had any issues. I know this maybe be hype but these motors are very expensive to repair and parts are limited so for the extra cost of of a good syn oil, I will use whatever is reccomended as being the best for an older engine.

Maybe traditional Dino oil would be better then the new synthetics?

[WB9MCW]

" Is there a good additive one can add to an oil change? "

Well according to the General---

From General Motors (Chevrolet): add EOS, their oil fortifier, to your oil, it’s only about $12.00 for each oil change for an 8 ounce can (This problem seems to be something GM has known about for some time!).

So what I plan to do= the Mobile 1 and EOS.

Unless a better idea comes along

[bobbyhi]

Originally Posted by WB9MCW

" Is there a good additive one can add to an oil change? "

Well according to the General---

From General Motors (Chevrolet): add EOS, their oil fortifier, to your oil, it’s only about $12.00 for each oil change for an 8 ounce can (This problem seems to be something GM has known about for some time!).

So what I plan to do= the Mobile 1 and EOS.

Unless a better idea comes along

If the Mobil 1 for older engines has more zinc why not just it????

[DaveK]

Originally Posted by bobbyhi

If the Mobil 1 for older engines has more zinc why not just it????

That's what I'm planning to do. Canadian Tire here carries the Mobil1 High Mileage 10W30 so I'll use that.

[WB9MCW]

Good point proly a better deal---Will it have enough though???

"The new ILSAC GF-4 motor oils (10W30 and lower viscosities) do have reduced (0.08%) ZDDP in the formulation for longer longevity of the catalyst converter and system. This is not a problem on newer vehicle designs that utilize the roller cam, valve train technology however, if you have flat tappet cam, valve train technology you generally want higher ZDDP levels. Mobil1 15W50's, Mobil1 diesel motor oils, Mobil1 motorcycle motor oils and Mobil1 High Mileage 10W30 and 10W40 have high ZDDP levels and would be the best choices for these engines."

I wonder how high is high??? Bet the EOS is a lot higher---could too much zinc be a bad thing I wonder---somehow I think not!!!

[bobbyhi]

Bryan,

I'm not going to worry about it.

[tf95ZR1]

FYI and FWIW, this is from a C4 parts CD I have:

"% zinc is the amount of zinc used as an extreme pressure, anti- wear additive. The zinc is only used when there is actual metal to metal contact in the engine. Hopefully the oil will do its job and this will rarely occur, but if it does, the zinc compounds react with the metal to prevent scuffing and wear. A level of .11% is enough to protect an automobile engine for the extended oil drain interval, under normal use. Those of you with high revving, air cooled motorcycles or turbo charged cars or bikes might want to look at the oils with the higher zinc content. More doesn't give you better protection, it gives you longer protection if the rate of metal to metal contact is abnormally high.

The Data: (Note: this data is mostly from 1991 and is for SG rated oils. Some of the data is current, and I am working on collecting the most recent data. I have found over the years that the "better" oils remain the "better" oils. It is still valid as a place to start in your own search. The formulation of oils is constantly being updated and subject to change by the manufacturer at any time. The best thing to do is collect data on the oils you are interested in directly from the oil company.)

[An * after the oil name indicates current SH rated version.]

Listed alphabetically. Empty cells indicate the data was not available.

Brand VI Flash Pour %
ash %
zinc
20W-50
AMSOIL* 151 507 -45
AMSOIL Series 2000* 155 474 -47
Castrol GTX* 122 440 -15 .85 .12
Castrol Syntec Blend* 135 440 -17 .105
Chevron Supreme* 140 428 -17 <1
Exxon High Performance 119 419 -13 .70 .11
Havoline Formula 3 125 465 -30 1.0
Kendall GT-1 129 390 -25 1.0 .16
Pennzoil GT Perf. 120 460 -10 .9
Quaker State Perf.* 121 440 -20
Quaker State Motorcycle 140 440 -25
Red Line 150 503 -49
Shell Fire and Ice* 126 450 -10 .9 .12
Shell Truck Guard* 130 450 -15 1.0 .12
Spectro Golden 4 174 440 -35 .15
Spectro Golden M.G. 174 440 -35 .13
Ultra Chem 190 455 -34
Unocal 121 432 -11 .74 .12
Valvoline All Climate 125 430 -10 1.0 .11
Valvoline Turbo 140 440 -10 .99 .13
Valvoline Race 140 425 -10 1.2 .20
Valvoline DuraBlend 126 455 -17 <1.5 .125
Valvoline Synthetic 146 465 -40 <1.5 .12
15W-50
Mobil 1 170 470 -55
Mystic JT8 144 420 -20 1.7 .15
Red Line 152 503 -49
5W-50
Castrol Syntec* 175 465 <-54 .102
Chevron Supreme* 175 460 -38 1.45
Quaker State Synquest* 175 460 -50
Pennzoil Performax 176 -69
5W-40
Havoline 170 450 -40 1.4
15W-40
AMSOIL* 165 462 -49
Castrol 134 415 -15 1.3 .14
Chevron Delo 400* 134 424 -38 <1
Exxon XD3 417 -11 .9 .14
Exxon XD3 Extra 135 399 -11 .95 .13
Kendall GT-1 135 410 -25 1.0 .16
Mystic JT8 142 440 -20 1.7 .15
Quaker State* 129 420 -25
Quaker State HDX* 146 440 -30 .97
Quaker State HDX Plus* 148 420 -25 1.37
Red Line 149 495 -40
Shell Rotella w/XLA* 146 414 -32 1.0 .12
Valvoline All Fleet 140 -10 1.0 .15
Valvoline DuraBlend 137 450 -17 <1.5 .125
Valvoline Turbo 140 420 -10 .99 .13
10W-30
AMSOIL* 171 464 -54
Castrol GTX* 143 415 -32 1.07 .12
Castrol Syntec Blend* 138 415 -33 .105
Castrol Syntec* 157 455 <-54 .102
Chevron Supreme* 150 419 -27 <1
Exxon Superflo Hi Perf 135 392 -22 .70 .11
Exxon Superflo Supreme 133 400 -31 .85 .13
Havoline Formula 3 139 430 -30 1.0
Kendall GT-1 139 390 -25 1.0 .16
Mobil 1 160 450 -65
Pennzoil PLZ Turbo 140 410 -27 1.0
Quaker State* 140 410 -30 .9
Quaker State 4x4* 135 430 -35
Red Line 139 475 -40
Shell Fire and Ice* 155 410 -35 .9 .12
Shell Rotella w/XLA* 155 405 -37 1.0 .12
Shell Truck Guard* 155 405 -35 1.0 .12
Spectro Golden M.G. 175 405 -40
Unocal Super 153 428 -33 .92 .12
Valvoline All Climate 130 410 -26 1.0 .11
Valvoline Turbo 135 410 -26 .99 .13
Valvoline Race 130 410 -26 1.2 .20
Valvoline DuraBlend 142 440 -27 <1.5 .125
Valvoline Synthetic 140 450 -40 <1.5 .12
5W-30
AMSOIL* 186 478 -67
Castrol GTX* 160 410 -35 1.35 .12
Chevron Supreme* 167 410 -38 <1
Chevron Supreme Synt.* 169 468 -49
Exxon Superflow HP 148 392 -22 .70 .11
Havoline Formula 3 158 420 -40 1.0
Mobil 1 165 445 -65
Mystic JT8 161 390 -25 .95 .1
Quaker State* 155 405 -35
Quaker State Synquest* 168 450 -58
Red Line 151 455 -49
Shell Fire and Ice* 167 405 -35 .9 .12
Unocal 151 414 -33 .81 .12
Valvoline All Climate 135 405 -40 1.0 .11
Valvoline Turbo 158 405 -40 .99 .13
Valvoline DuraBlend 162 415 -38 <1.5 .125
Valvoline Synthetic 160 435 -40 <1.5 .12"

[WB9MCW]

thnx for the info tf95ZR1 -- I see that at least in 91 the ones that listed all had the .11% that you cite as a min. I wonder what the Mobile 1 reg. oil is now(2007) zinc % wise?