Quaker State and Pennzoil have been owned by Shell Oil since 2002. Completly different formula than was used in the old days....

 

dude...don't start...i know...

 

Not starting anything, just stating facts......

 

double post, sorry.

 

i use pennzoil platinum myself...was just wondering because a couple engines i've had apart that used quaker state looked like that...not bad just staind

 

Pennzoil platinum is very good oil as is Valvoline synpower. I use Castrol Syntec, 0W30 the European formula, (German Castrol)

I have never used Quaker State but have used Pennzoil. I have seen the varnish develop using Castrol GTX but then again have seen very clean engines with the GTX. I don't think the varnish is anything to worry about. Its not harmful.

have a good one.

 

i also use a mixture of castrol gtx and valvoline syn power oil treatment(can't find it anymore)...10oz of the treatment to 6qts of the gtx...makes a nice formula

 

I can’t tell you how many different types of oil have been in that truck. But for the last two years it has been mobil1 synthetic and mobil1 synthetic high mileage