Muscle car Zinc oil

[Rock_Hudstone]

Originally Posted By: Building3
Mobil 1 15w-50 Zn levels are unchanged at 1300. Mobil reduced the Zn in the Mobil 1 High Mileage oils. According to the Pennzoil rep, the Quaker State Defy High Mileage Zn is unchanged at 1200.

QS Defy went from a high zinc content SL grade oil to SN grade in mid 2015. That means regulatory standards limit Zn and P levels to approx
https://bobistheoilguy.com/forums/ubbthreads.php/topics/3779241/1

Mobil 1 15w-50 is now SN grade as well.

 

[FCD]

M1 15W-50 still has an ok amount of ZDDP even though it is SN.
Something like Valvoline VR1 10W-30 would be ideal for your GTO

 

[Building3]

As of June 2, 2017: 2017 Mobil 1 Product Guide lists 15w-50 as 1300 Zn and SN. Pennzoil representative confirms Zn has not changed on Defy.

 

[Building3]

Update and correction: Talked to Mobil and Shell/Pennzoil/Quaker State techs again: Mobil 1 15w-50, Turbo Diesel, FSX and FS remain the same zinc levels as stated in the 2017 Product Guide. All above 1000 and are SN rated.

Quaker Sate Defy SN has now been lowered to below 1000 ppm. At Shell/Pennzoil/Quaker Sate, the only oil above 1000 ppm is Rotella.

 

[W3DRK]

I'm not familiar with this particular engine family but my 2 cents...unless you have a specific reason to run such a heavy oil like 20w-50, I'd be VERY weary about trashing cam/distributor drive gears pumping an oil like that in cooler weather (not that it gets too cold in your region).

A lot of times hopped-up engines are rebuilt using high-volume oil pumps and I've personally seen the teeth worn almost clean off the distributor gear that drives the oil pump when excessively heavy oils were used. These were both SBCs and in one case the owner was running 15w-40 and the other guy was running 20w-50 in cool North East weather. I suspect even with the pump's bypass wide open, all that molasses oil was doing was wasting gobs of energy in the pump and eventually caused premature failure of the distributor gears, trashing the cam gears too.

On an engine that's rebuilt to operate within factory tolerances, there's absolutely no need to run oil heaver than originally specified.

 

[FCD]

Originally Posted By: W3DRK
I'm not familiar with this particular engine family but my 2 cents...unless you have a specific reason to run such a heavy oil like 20w-50, I'd be VERY weary about trashing cam/distributor drive gears pumping an oil like that in cooler weather (not that it gets too cold in your region).

A lot of times hopped-up engines are rebuilt using high-volume oil pumps and I've personally seen the teeth worn almost clean off the distributor gear that drives the oil pump when excessively heavy oils were used. These were both SBCs and in one case the owner was running 15w-40 and the other guy was running 20w-50 in cool North East weather. I suspect even with the pump's bypass wide open, all that molasses oil was doing was wasting gobs of energy in the pump and eventually caused premature failure of the distributor gears, trashing the cam gears too.

On an engine that's rebuilt to operate within factory tolerances, there's absolutely no need to run oil heaver than originally specified.

In death valley 20W-50 would not be crazy in a SBC, but for a stock engine in not crazy high heat 15W-40 is the thickest it should need.

 

[A_Harman]

Valvoline VR1 10w30.

I love those old Pontiacs, especially when they still have the original mills in them.
I hate it when people put Chevy engines in Pontiacs.

 

[brave sir robin]

day 3: still no pics

huehuehue

 

[vwalburn]

 

[Nickdfresh]

She's a beaut!

 

[SR5]

Wow !!!! That car looks great.

 

[FCD]

Nice

 

[Nickdfresh]

X3 the Mobil 1 10W-40 HM...

 

[udidwht]

Either Bradd Penn or Valvoline VR-1