Castrol gtx for primary
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Stellar HDF Member
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From: Southern California
Castrol gtx for primary
Wondering what your thoughts are on using Castrol GTX (20W-50) Drive Hard for the primary. Any of you use it? I have about 5 quarts left sitting on my shelf that I'd like to use up (used to use it in my BMW). I use Mobil-1 75/140 Synthetic for my tranny, Mobil-1 20W-50 V-twin Synthetic for my motor and currently running Formula + for my primary. Please let me know your thoughts.
Tourer
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From: East Texas
Seasoned HDF Member
Joined: Dec 2004
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From: Texas! Ya mean there's someplace else?
20w-50 isn't too heavy as it was recommended by HD at one time. You don't want the friction modifiers in an oil used in a wet clutch application. The 10w-40 and up viscosity oils will generally not cause clutch slippage as they don't have to be formulated to meet the very low friction specs the lower viscosity oils do for our modern car engines.
Last edited by pococj; Jul 29, 2009 at 06:19 AM.
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Stellar HDF Member
Joined: Nov 2005
Posts: 3,272
Likes: 83
From: Southern California
Thread Starter
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Stellar HDF Member
Joined: Nov 2005
Posts: 3,272
Likes: 83
From: Southern California
20w-50 isn't too heavy as it was recommended by HD at one time. You don't want the friction modifiers in an oil used in a wet clutch application. The 10w-40 and up viscosity oils will generally not cause clutch slippage as they don't have to be formulated to meet the very low friction specs the lower viscosity oils do for our modern car engines.
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Stellar HDF Member
Joined: Nov 2005
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From: Southern California
Amsoil is a great product, but difficult to find because of their distribution system, so for that reason I use Mobil-1 in engine and tranny. I've had good results.
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Ultimate HDF Member
Joined: Sep 2005
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From: Ozark Country
I don't know why you would want to use a 'high dollar' synthetic fluid in the primary.
The fluid in the primary isn't under much of a load, and it's main purpose is only to 'splash' the clutch plates and primary chain.
Myself and the majority of guys I know and ride with use regular Rotella T 15W40 in the primaries of Harleys.
It's heavy duty, works great, and costs less than $3.00 a quart.
BTW, it's also passed JASO-MA tests meaning there are no 'friction modifiers' that might cause problems with a wet clutch setup.
The fluid in the primary isn't under much of a load, and it's main purpose is only to 'splash' the clutch plates and primary chain.
Myself and the majority of guys I know and ride with use regular Rotella T 15W40 in the primaries of Harleys.
It's heavy duty, works great, and costs less than $3.00 a quart.
BTW, it's also passed JASO-MA tests meaning there are no 'friction modifiers' that might cause problems with a wet clutch setup.
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Club Member
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From: 40 miles Northeast of Indy..
Wondering what your thoughts are on using Castrol GTX (20W-50) Drive Hard for the primary. Any of you use it? I have about 5 quarts left sitting on my shelf that I'd like to use up (used to use it in my BMW). I use Mobil-1 75/140 Synthetic for my tranny, Mobil-1 20W-50 V-twin Synthetic for my motor and currently running Formula + for my primary. Please let me know your thoughts.
+1, This is the same oils that I'am going to this change and from now on..
I have used the F+ since the 1k with 0 problems, now 21K. I wont change Clutch oils around.
Been using syn3 in motor, no more, no complaints, just think M1 VT is better.
Have Bel-ray 80-145 in tranny now, no issues, just want to go with full Syn in tranny, so it will be M1 75-145 lube from now on.
I will stay with the HD filter also.
Road Warrior
Joined: Jul 2009
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From: Northern Colorado
Motor oil isn't a magic elixir that is to be poured in all holes on a bike as some would have you believe. Just because you can doesn't necessarily mean that you should, it's not the "ideal" stuff to be using in your tranny and chaincase.