Thickest 20w50
- Thread starter Racerjk
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Cold 20w-50!
Seriously though, if you wanted something THICK, why not a 25w-60? I've never seen it, but the Australians here talk about oils this thick and thicker.
Dave
Penrite HPR 50 is 40W70. Sold worldwide including the U.S
Thickest 20w-50 I've seen is Castrol's High Milege product. It has a cSt@100c of 20.3
20.3 @ 100C? That's baby oil. Real auto's use 40W70. 33.7 cSt @ 100C, Cold Cranking viscosity cP @ -5C 12,693, VI 109, Flash 207C. Designed to "provide enhanced protection against wear, corrosion, oxidation, sludge under tough Australian conditions". Use in older oil burning engines, speedway and drag racing engines, or older large capacity engines operating under high temp/high load conditions such as towing in the outback"
Now that's a thick oil. ![[Big Grin]](images/icons/grin.gif)
Dave
Dave40w70 in the crankcase? Wow! Why don't they just call it "gear lube" and call it a day!
I think you are looking for the wrong thing. Most 20w-50 dino oils will be low 40 weight in a few thousand miles if not 30w. What you want is an oil that stay at it rating for 3000-6000 miles.
Delo 400 starts as a high 40weight oil almost 50 weight and finished as a medium 40 weight after 5000 miles+. Unless you go synthetic no 50 weight dino oil will do this.
quote:Assuming they start with a 20w base oil I did not think there would be that much viscosity index improver added to get a 20W50. It's viscosity index is lower than even a 10w30, indicating that its viscosity changes less (from cold to hot) that a 10w30 does, and which leads me to believe it is a pretty stable oil, unless it is poorly manufactured.
Originally posted by TR3-2001SE: I think you are looking for the wrong thing. Most 20w-50 dino oils will be low 40 weight in a few thousand miles if not 30w.
I have a truck with a fairly "hot" 350 in it. The reason I asked about the thick oil is that I have oil pressure that is too low for my tastes. It's been that way since the engine was built.
Even with 20w50, the oil pressure is not much over 20-25 psi @ idle. I started out running 10w30, and the oil pressure was downright scary.
quote:Hot idle or cold idle? Is the engine just old and worn out? All internals "properly" installed? Thought of using a different oil pump? 20-25 at a hot idle though seems fine to me....
Originally posted by Racerjk: Even with 20w50, the oil pressure is not much over 20-25 psi @ idle.
Well, this engine has not run in a while due to valvetrain problems. I'm on my 3rd set of valve springs. The last time this happened, I got aggravated and parked the truck.
I don't remember exactly what the PSI used to be. I think it even got below 20 psi @ idle. My Formula has a little over 20 psi at hot idle, and I remember now the psi on my truck being even lower than that.
This engine had all new stuff put in it, and it only has 5 or 6,000 miles or so on it. It has TRW forged pistons, and the rings and bearings are Federal Mogul. The block was decked, squared and align-bored. Of course, it has a new oil pump also. Is there a difference in a high volume and high pressure oil pump??
The rule of thumb is 10 psi per 1000 rpm right??
[QUOTE]What's the thickest 20w50 out there?[QUOTE]
Mobil 1 V-Twin - SUS Viscosity @210F (tested) = 101.8 in a revcent VOA. Real high 50 weight. Pretty good add package too. Awfully expensive though.
I use to use Kendall Nitro 70,which is straight 70 weight oil! ![[Eek!]](images/icons/shocked.gif)
Redline makes a 20w60, which is 23 cst at 100. I would imagine that it is pretty shear stable.
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