Oil choice

[53' Stude]

Good Afternoon folks. Let’s say you have a older, carbeurated car/truck and you have in your possession Castrol GTX 10w40 SN rated and QSAD 10w40 SN rated motor oil. Which would you use? Been a long day and thought I would lighten the mood on a overcast Monday.

Have a happy Monday folks

 

[zrxkawboy]

Sorry to avoid the question, but I consider both brands to be excellent. Personally, I’m partial to QS, but wouldn’t hesitate to use Castrol, either.

 

[Schwifty]

Depends on the engine. What is it? V6, V8, Straight 6 ?

 

[aquariuscsm]

I too would pick the QS.

 

[kstanf150]

QS

 

[02zx9r rev2]

I will be the odd one out and say GTX

 

[Zee09]

GTX

 

[ka9mnx]

Is there a difference?

 

[aquariuscsm]

I like the QS for the moly.

 

[bbhero]

I too would pick the QS.

Me too.

QS runs quiet in most vehicles.

I like the 10w40 being that a carburetor would be more likely to put a bit more fuel in the oil therefore dropping operational viscosity in this upcoming winter time.

 

[zrxkawboy]

Depends on the engine. What is it? V6, V8, Straight 6 ?

Which brand would be better for which engine configuration, and why?

 

[SR5]

I’m a GTX sort of guy.

 

[SR5]

This was posted by member OVERKILL in another thread, unfortunately it doesn’t include QS (which I’m sure is fine) but the GTX does OK in the Noack showdown

Just a few data points from the PQIA site:
1. Kendall GT-1 Semi-Syn 10w-40 (SN): Noack 11.7%
2. Pennzoil yellow bottle 10w-40 (SN): Noack: 12.8%
3. Chevron Supreme 10w-40 (SN): Noack: 10.8%
4. Castrol GTX 10w-40 (SN): Noack: 11%
5. Chevron Havoline 10w-40 (SN): Noack 13.1%
6. Mag1 10w-40 (SN): Noack 10.8%
7. Citgo SuperGuard 10w-40 (SN): Noack 14.6%

Here is the PQIA VOA

PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM

The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality of lubricants in the marketplace. Our mission is to serve the consumer of lubricants by randomly sampling and independently testing lubricants taken from the field. Test...

www.pqiadata.org

 

[SatinSilver]

QS and it’s related PYB.