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#252453 - 05/07/09 8:11 pm Castrol 4T M/C Oil Versus Castrol GTX  
Joined: May 2009
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MrRippington Offline
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MrRippington  Offline
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Howdy fellers, got a quick oil related question for those in the know. I've been usin' Castrol GTX 20w-50 in my 1970 TR6R, and I'm considering adding a ZDDP additive (zinc additive). Now, I've come across Castrol 4T Motorcycle oil in my local auro parts store, which is SG rated and is available in 20w-50, although it seems the 10w-40 weight is more common.

Do any of you blokes have advice as to whether the Castrol 4T motorcycle oil is a superior oil for use in a 1970 Triumph 650 compared to Castrol GTX, and if the zinc additive is beneficial to either the Castol GTX or 4T oils when used in this application. I think I remember readin' that the zinc additive aides the tappet to cam lubing.

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#252468 - 05/07/09 9:04 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: MrRippington]  
Joined: Dec 2006
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btour Online content
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btour  Online Content
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Massachusetts, U.S.A.
Hi Mr. Rippington,

I do not know, but you may have found a good oil. What is the cost vs GTX? Just curious. I will speak to the OIl Guy tomorrow about this.

Futhermore, the fact that Castrol has this new 20-50 blend, may indicate, that perhap it has added moly to its GTX. Moly bad. Zinc good.

This may explain a few things. Clutch slip, and black deposits. I wonder what a little oil moly added to the plug hole would do? It is a heavy metal.

Anyway SG is circa the oil for our bikes.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
#252501 - 05/07/09 11:56 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
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MrRippington Offline
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MrRippington  Offline
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Hey btour,

When I was buyin some of the Castrol GTX 20w-50 I noticed some of the Castrol 4T on the store shelf, but it was 10w-40. I did a little research and found that it's made in 20w-50 and that it's SG rated.

Here's a link to the Castrol company's website describing the 4T oil:

http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9022114&contentId=7040925

Neither the GTX or 4T oils have the zinc in them, though. I was going to add an additive with ZDDP in it to whichever oil I used. I was thinking that maybe the 4T is a better oil for the application of using it in a 1970 Triumph 650, but most people say use GTX, but that isn't rated SG, it's rated SM.

Anyways, I figured I'd ask you experts what you think of this Castrol 4T type of oil in a 20w-50 weight.

#252589 - 05/08/09 1:51 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: MrRippington]  
Joined: Nov 2008
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desco Online content
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desco  Online Content
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Bishop, Calif.
Go to "britcycle.com" and click on "Tech Help Files". Scroll down to "oil recommendations". It should make up your mind on which oil to use.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#252625 - 05/08/09 5:05 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
Joined: Dec 2006
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btour Online content
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btour  Online Content
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Massachusetts, U.S.A.
Hi All,

I just heard that Cam 2 has a new oil out for the race crowd. A 70 weight ( that is for the alcohol burners, because of high fuel dilution ), and a 20/50. Both are high zinc and no moly. Cost from my guy, Mike, will be about $5.00 a quart.

The problem with getting one blended especially for us is the high cost of packaging. Drums would be no problem.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
#252626 - 05/08/09 5:11 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
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desco Online content
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desco  Online Content
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Bishop, Calif.
The problem with special oils is you have to carry them with you where ever you go. Valvoline 4 stroke 20/50 is available just about every where. It's like race gas, if you never get too far from home it's fine.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#252655 - 05/08/09 8:44 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
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btour Online content
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btour  Online Content
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Massachusetts, U.S.A.
I called Castrol. I spoke to a very nice lady with a British accent. She checked my questions, and called me back. There is no info on what is in 4T or any other Castrol oil. It is called propriatary info. Not available. I suggested it would behoove them to make it available, and she will pass on that suggestion. Until they do, we will not know if there is moly in it.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
#252656 - 05/08/09 8:52 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
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btour Online content
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btour  Online Content
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Massachusetts, U.S.A.
Hi Desco,

Valvoline 20/50 comes in three flavors. Two of those says not suitable for wet clutches, so you can bet there is moly in them. The other vr1 racing does not say not suitable so you might assume it does not, but it also says it has "friction additives". Now zinc is included in that catagory. So again all you can do is assume it has zinc and no moly.

Now the thing about the Cam 2, new stuff, is that they guarantee no moly, and high zinc. Mike is buying a pallete of the stuff. If the company is willing to disclose what is in it, to wholesaler, that is a good sign to me. Secrecy Bad. Disclosure Good, no priceless.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
#252662 - 05/08/09 9:36 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
Joined: Nov 2008
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desco Online content
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desco  Online Content
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Bishop, Calif.
Valvoline 20/50 Motorcycle oil (not 4 stroke, my mistake) is one of five oils recommended by Megacycle cams and is the only one readably available in most chain auto parts stores. They specifically warn against using Castrol GTX or Mobil 1.
I have used Pennsoill, Valvoline and Castrol 20/50 for years in my 72 and when I drained the oil it came out looking and feeling like black water. The Motorcycle specific oil comes out still slippery. I'm sold.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#252690 - 05/09/09 2:03 am Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: desco]  
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MrRippington Offline
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Posts: 26
USA
I think I'm going to use Castrol 4T, it seems like a very good quality motorcycle oil. I was vacilating 'bout using Valvoline motorcyle oil, probably just as good or maybe even better if you're not addin' a zinc additive.

I figure the 4T is certainly better suited for my purpose than GTX. But I would agree that it may not have a sufficient level of zinc, it's hard to know since they don't specify (proprietary secret and all that). I'm going to add a zinc additive called zddplus to know for sure the level of zinc is sufficient. Here's a link to the product's website:

http://www.zddplus.com/

#252692 - 05/09/09 2:37 am Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: MrRippington]  
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Bud Provin Offline
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Bud Provin  Offline
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Vermont
GM used to sell an oil supplement which was loaded with ZDDP. It was intended for break in of automotive flat tappet cams. If still available, it should be just what you're looking for.

Spectro oils are also laden with zinc, and their conventional oils are reasonably priced.

#252699 - 05/09/09 8:39 am Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: MrRippington]  
Joined: Oct 2004
Posts: 4,429
Tiger Offline
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Tiger  Offline
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Posts: 4,429
Melbourne Australia
That is a good site Mr R, I have a friend who runs a quite fast methanol burning classic sidecar, he traditionally has run Castrol R [castor oil based] and has experienced cam wear.

Trying to talk him into a switch to high ZDDP mineral oil at rebuild, the cost of "R" is insane, you could change good mineral every race and come out well ahead.

Last edited by Tiger; 05/09/09 8:39 am.

1969 TR6R
7.62 x 51 is not a maths puzzle.
#252720 - 05/09/09 12:39 pm Re: Castrol 4T M/C Oil Versus Castrol GTX [Re: btour]  
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btour Online content
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btour  Online Content
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Massachusetts, U.S.A.
Read the article. Not quite sure about the reference to phosphorus and EP. Extra pressure. Phosphorus eats yellow metals. EP rated lubricants will eat yellow metals.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.

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