Thanks for the info. I'll stick with castrol my family has used it since early 1900's. Hey check this site out!!!!
Valvoline
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Senior User
Joined: Nov 2002
Posts: 294
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From: Central Coast, California
Valvoline
I've been a loyal buyer of castrol Gtx for the life of my vehical. I will continue to buy castrol. I have a question about valvoline. If it Causes sludge in your engine then why doese it say #1 Choice of ASI mechanics.
Another question about motor oil. Doese castrol cause sludge or is that just a myth. Im going to rebuild my 1945 9n ford tractor. It has a straight four. I want to break it in on dino then switch to A full synthectic. Which brand will benifit me the most. (I'm going to work the engine hard.!!!!!)
Another question about motor oil. Doese castrol cause sludge or is that just a myth. Im going to rebuild my 1945 9n ford tractor. It has a straight four. I want to break it in on dino then switch to A full synthectic. Which brand will benifit me the most. (I'm going to work the engine hard.!!!!!)
Senior User
Joined: May 2002
Posts: 175
Likes: 0
From: fort smith, ar
Valvoline
I suspect that sludge is more a result of engines than a particular brand of oil, or possibly leaving an oil in an engine far too long. The only company to struggle lately with an engine sludging problem is Toyota with a select few of their V6 and 4 cyl engines. They initially blamed poor owner maintenance, but that was hard to believe because it implied that since they were the only company with such a public problem, Toyota buyers as a group were more prone to poor maintenance habits than other car buyers in general. Yeah, right. If you're happpy with Castrol, stick with it. It's a decent oil. Other good dino oils are Penzoil & Chevron. Plain old Mobil Drive Clean contains a lot of detergent additives, and my local Toyota dealer for one, claims it is the oem supplier of "toyota" brand oil. Who knows!
Elder User
Joined: Jun 2001
Posts: 913
Likes: 0
From: Canada
Valvoline
Penzoil has too many degergents for my liking - the stuff froths up like crazy!
Quaker State was good oil at one time.
I'll stick with Valvoline - it works for me and I know quite a few mechanics who swear by it.
Keep it Rubber Side Down!
Quaker State was good oil at one time.
I'll stick with Valvoline - it works for me and I know quite a few mechanics who swear by it.
Keep it Rubber Side Down!
Senior User
Joined: Oct 2002
Posts: 286
Likes: 0
From: USA
Valvoline
I think any SL rated oil is going to perform well as it relates to not sludging and if you change it every 3000 I doubt any high grade oil will sludge (including Penzoil/Quaker State). I have also read about some Toyota's having engine sludge and it appears to be because of shearing of the oil. This is a good test case because from what I've read those that ran a good synthetic weren't having the sludging problem. Also those that changed it at 3000 or less didn't have the problem from what I've heard. I'm experimenting with using M1 in my Toyota Camry and will run analysis at around 5k miles to see how it's holding up. I might just test it at 3k to see if I should run it to 5000.
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Valvoline
I`ve heard and read that valvoline all-climate and castrol GTX are better than most dinos in the area of shear-stable viscosity improvers.That is desirable if you are going to use a non-synth oil.:-)
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Joined: Jan 2002
Posts: 140
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From: CT USA
Valvoline
Correct me if im wrong but i think Penzoil containes the additive PTFE which is basically little pieces of teflon. I used to use Penzoil until i heard this. It rare cases it can build up and clog your oil filter and can sometimes be found after you drain the oil in the motor. This never happened to me so im not sure but personally i use valvoline which everyone tells me good things about. (max life in my 3.8 chrysler with 150000 miles and not the slightest leak or sludge build up, and in my ranger 2.8 also with more than 150000 miles and no leaks.) As for my toyota V6 i havent noticed any sludge in it but it only has 50000 miles. I have the toyota dealer change my oil because they do it for free for the life of the car (pretty sweet deal huh?) but the motor does like a very thin oil. maybe the sludge is caused by putting in a oil that is too heavy. And since i told about all my cars i wont leave out my 67'bronco with a freshly rebuilt 289 which i put in valvoline but i am thinking of switching to synthetic because it isnt run very much. 
Senior User
Joined: Apr 2002
Posts: 467
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From: On the farm near Loveland
Valvoline
I don't know if that teflon story is accurate. Because it can plug oil passages and potentially cause engine damage, DuPont (who makes teflon) supposedly prohibits its sale and promotion for use as an oil supplement. DuPont also says that teflon used as an oil additive is completely worthless.
I know that Fram used to sell oil filters pre-charged with teflon particles and they've been discontinued for some time now.
Like Robin Williams once asked, "If nothing sticks to Teflon, how can it stick to a frying pan?"
I know that Fram used to sell oil filters pre-charged with teflon particles and they've been discontinued for some time now.
Like Robin Williams once asked, "If nothing sticks to Teflon, how can it stick to a frying pan?"
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 7,298
Likes: 45
From: Southern California
Valvoline
I don't think Pennzoil or any other reputable manufacturer ever put PTFE in their oil. PTFE was mostly hawked as an additive. Pennzoil's proprietary anti-wear component was Z-7, which probably used zinc.
Posting Guru
Joined: Dec 2001
Posts: 1,668
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From: Lincoln USA
Valvoline
One other thing to watch out for in an oil is the viscosity spread. 30 or more points can lead to sludge build up as the polymers break down. That's why many engine warranties are voided if 10W-40 is used. 20W-50 doesn't seem to have such a problem as the base oil is thicker to begin with. Stay with a viscosity spread of 25 points or less.
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BigMattXXL
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