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Re: Castrol Syntec 20w50 for classic cars? [Re: river_rat] #1982291
08/10/10 10:00 PM
08/10/10 10:00 PM
Joined: Jun 2004
Posts: 2,687
South Carolina
bmwtechguy Offline
bmwtechguy  Offline

Joined: Jun 2004
Posts: 2,687
South Carolina
I was in Autozone the other day and noticed (before I saw this thread) that the Syntec 20W-50 bottles had "Classic Car Formula" listed on the front label. Now I know why - additional ZDDP for older, non-roller valvtrains.

Re: Castrol Syntec 20w50 for classic cars? [Re: river_rat] #1982366
08/10/10 11:12 PM
08/10/10 11:12 PM
Joined: Jun 2010
Posts: 1,239
Duval Co. Jax FL, USA
HangerHarley Offline
HangerHarley  Offline

Joined: Jun 2010
Posts: 1,239
Duval Co. Jax FL, USA
Originally Posted By: river_rat
Originally Posted By: sparkplug
Yeah, the bottles say "Formulated for Classic Cars" on it.

I remember seeing it online only.
However, a couple weeks ago I called Castrol and asked what oil I should use for my '69 VW camper just to see what they said. They told me to use Syntec 20W-50 because it has 1200 ppm zinc for flat tappet engines.
They made no mention of any classic car formulas. Is the "classic" still even being sold?


River Rat, the 20W-50 is the only Syntec in that grade, so its almost certainly the Classic Car Formula they speak of.

Only other Syntec in a "50" KV is 5W-50, so maybe for Winter use, thats a good choice, and 20W-50 for the rest of the year.

Synthetic Pumpability of a 20W. Nice! thumbsup

Re: Castrol Syntec 20w50 for classic cars? [Re: HangerHarley] #1982633
08/11/10 08:34 AM
08/11/10 08:34 AM
Joined: Apr 2009
Posts: 3,402
Iowa
river_rat Offline
river_rat  Offline

Joined: Apr 2009
Posts: 3,402
Iowa
My bad. I see the label says classic cars on it.
I was thinking of the retro looking jugs they used to sell.

Re: Castrol Syntec 20w50 for classic cars? [Re: river_rat] #1982890
08/11/10 12:41 PM
08/11/10 12:41 PM
Joined: Mar 2008
Posts: 507
St. louis
EagleFTE Offline
EagleFTE  Offline

Joined: Mar 2008
Posts: 507
St. louis
The only time I have seen the Classic Car 20W50 Syntec was on the shelf at the local NAPA. It was selling for about $7.50 as a recall and had a thick layer of dust on the bottles. I think their pricing makes it hard to compete with M1 15W50 at $4.25 and some others. In any event here is a quote from some Castrol Email corresspondence from about two years ago.

"Unfortunately the information you are requesting in proprietary. The Castrol GTX 20W-50 has had a reduction of zinc and is not recommended to be used in Classic cars with flat tappet cams.

Although the exact amount of zinc is proprietary, the level of Zinc in the new re-formualted full synthetic Syntec 20W-50 is a minimum of 1200 ppm, which will provide excellent anti-wear protection for the cam and lifters in a flat-tappet cam engine."

Last edited by EagleFTE; 08/11/10 12:42 PM.
Re: Castrol Syntec 20w50 for classic cars? [Re: EagleFTE] #1983101
08/11/10 04:32 PM
08/11/10 04:32 PM
Joined: Jun 2010
Posts: 1,239
Duval Co. Jax FL, USA
HangerHarley Offline
HangerHarley  Offline

Joined: Jun 2010
Posts: 1,239
Duval Co. Jax FL, USA
Originally Posted By: EagleFTE
The only time I have seen the Classic Car 20W50 Syntec was on the shelf at the local NAPA. It was selling for about $7.50 as a recall and had a thick layer of dust on the bottles. I think their pricing makes it hard to compete with M1 15W50 at $4.25 and some others. In any event here is a quote from some Castrol Email corresspondence from about two years ago.

"Unfortunately the information you are requesting in proprietary. The Castrol GTX 20W-50 has had a reduction of zinc and is not recommended to be used in Classic cars with flat tappet cams.

Although the exact amount of zinc is proprietary, the level of Zinc in the new re-formualted full synthetic Syntec 20W-50 is a minimum of 1200 ppm, which will provide excellent anti-wear protection for the cam and lifters in a flat-tappet cam engine."


Good. That means it had MORE than 1200PPM of Zinc at one time.

AutoZone will sell 5 quarts AND a Filter for $27.99 once every couple months or so. This is the only way to do it, since $7.50 is .50 less than Edge (??) and more than M1 and PP .. and even PU!

Seems that bottling is Castrol's "Red Cap" Syntec. thumbsup

Lets Search for it for Sale!

And yes, only one ive seen of it is 5W-50 and it has 5W-50 in a Red box. Red Cap!! thumbsup (5W-40, 5W-30, 10W-30 and 10W-40, IIRC. 0W-30 is GC AND "AC," American Castrol 0W-30 "AFE.".)

Re: Castrol Syntec 20w50 for classic cars? [Re: HangerHarley] #1983196
08/11/10 06:26 PM
08/11/10 06:26 PM
Joined: Apr 2009
Posts: 3,402
Iowa
river_rat Offline
river_rat  Offline

Joined: Apr 2009
Posts: 3,402
Iowa
I may go back to synthetic in the VW. Tried before and it leaked so badly I gave up.
Lately the many small seal leaks - mostly the pushrod tub seals - have gotten bad enough that I put in some Bars Leaks and it stopped leaking.
But I'll probably go back to Mobil 1 15W-50. That made it sound the smoothest and quietest.

Re: Castrol Syntec 20w50 for classic cars? [Re: river_rat] #2003838
08/31/10 07:14 PM
08/31/10 07:14 PM
Joined: Aug 2010
Posts: 73
Chicago, Illinois
carman594 Offline
carman594  Offline

Joined: Aug 2010
Posts: 73
Chicago, Illinois
I heard this particular oil was indeed a PAO. Can anyone confirm this?

Re: Castrol Syntec 20w50 for classic cars? [Re: carman594] #2004676
09/01/10 03:23 PM
09/01/10 03:23 PM
Joined: Aug 2010
Posts: 73
Chicago, Illinois
carman594 Offline
carman594  Offline

Joined: Aug 2010
Posts: 73
Chicago, Illinois
Anyone?

Re: Castrol Syntec 20w50 for classic cars? [Re: carman594] #2004711
09/01/10 03:56 PM
09/01/10 03:56 PM
Joined: Dec 2006
Posts: 19,984
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline

Joined: Dec 2006
Posts: 19,984
Dallas,Tx USA
Autozone replaced the Syntec 5W50 with it awhile back,and now it`s gone and they restocked the 5W50 again.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 10W30

Re: Castrol Syntec 20w50 for classic cars? [Re: aquariuscsm] #2005083
09/01/10 10:34 PM
09/01/10 10:34 PM
Joined: Aug 2010
Posts: 73
Chicago, Illinois
carman594 Offline
carman594  Offline

Joined: Aug 2010
Posts: 73
Chicago, Illinois
Originally Posted By: aquariuscsm
Autozone replaced the Syntec 5W50 with it awhile back,and now it`s gone and they restocked the 5W50 again.


Well I still see it, I just bought 8 quarts a couple weeks ago

Re: Castrol Syntec 20w50 for classic cars? [Re: moosestang] #2664854
06/25/12 07:25 PM
06/25/12 07:25 PM
Joined: Jun 2012
Posts: 241
Vero Beach FL
N7Quarian Offline
N7Quarian  Offline

Joined: Jun 2012
Posts: 241
Vero Beach FL
Bump for a question. I heard thaat if you shouldnt use this oil on an engine that has Catalytic Converters because it might damage them. Is this true?


1999 E46 BMW 328i
Engine: Mobil 1 0w40
Manual: Trans. Redline D4 ATF
Diff: Redline 75w90
Re: Castrol Syntec 20w50 for classic cars? [Re: N7Quarian] #2664861
06/25/12 07:33 PM
06/25/12 07:33 PM
Joined: Oct 2009
Posts: 8,576
Ohio
mechanicx Offline
mechanicx  Offline

Joined: Oct 2009
Posts: 8,576
Ohio
Originally Posted By: N7Quarian
Bump for a question. I heard thaat if you shouldnt use this oil on an engine that has Catalytic Converters because it might damage them. Is this true?


It's really only a concern if you have OBD11 with an O2 sensor after the cat or have emission testing in your area. Do you have that there? I'm thinking not if your owner's manual recommends 20W50. Excess phophorus only possibly damages the cat in an emissions level sense and not otherwise structurally or functionally.

Re: Castrol Syntec 20w50 for classic cars? [Re: mechanicx] #2664871
06/25/12 07:43 PM
06/25/12 07:43 PM
Joined: Jun 2012
Posts: 241
Vero Beach FL
N7Quarian Offline
N7Quarian  Offline

Joined: Jun 2012
Posts: 241
Vero Beach FL
I don't have emmisions testing and I don't see an O2 sensor after the Cat, heck I don't se ANY o2 sensors at all. My engine does have variable Valve timing though and I'm wondering that if this oil might damage my engine because it says that its specifically used for 'Classic vehicles'.
I'm currently using M1 15W50. Is that basically the same thing but M1?

Last edited by N7Quarian; 06/25/12 07:47 PM.

1999 E46 BMW 328i
Engine: Mobil 1 0w40
Manual: Trans. Redline D4 ATF
Diff: Redline 75w90
Re: Castrol Syntec 20w50 for classic cars? [Re: N7Quarian] #2664876
06/25/12 07:48 PM
06/25/12 07:48 PM
Joined: Oct 2009
Posts: 8,576
Ohio
mechanicx Offline
mechanicx  Offline

Joined: Oct 2009
Posts: 8,576
Ohio
Then you have nothing to worry about. The US ran cats for over 20 years with higher zddp oil and good part of that with pre cat o2 sensors (not that it matters) before anyone was concerned about cat poisoning.

I'm kind of surprised you have FI and VVT and a cat but no precat O2 sensor. Higher phosphorus wear additve oil will not hurt your engine, it offers more protection insurance. and 50W won't harm your VVT. It's a recommended grade.

Last edited by mechanicx; 06/25/12 07:51 PM.
Re: Castrol Syntec 20w50 for classic cars? [Re: mechanicx] #2664895
06/25/12 08:06 PM
06/25/12 08:06 PM
Joined: Jun 2012
Posts: 241
Vero Beach FL
N7Quarian Offline
N7Quarian  Offline

Joined: Jun 2012
Posts: 241
Vero Beach FL
lol I may be wrong about the o2 sensor but the time i've owned the car I never seen an 02 sensor anywhere. (But then again I havent really tried to look for one lol.) I wouldnt be surprised if there isn't one lol. My automatic transmission doesnt even have a filter lol, just a strainer. Simplicity at its best.

Another quastion. I'm currently using M1 15w50 but the Castrol that they sell here is 5w50 (edge classic vehicles.) Which would be better for hotter climates?

Final question lol. Why would this type of oil affect whats coming out the tail pipe? I'm not burning or using any oil.

Last edited by N7Quarian; 06/25/12 08:07 PM.

1999 E46 BMW 328i
Engine: Mobil 1 0w40
Manual: Trans. Redline D4 ATF
Diff: Redline 75w90
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