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I would like use a synthetic oil in my primary, but here in brazil we do not have to much choices. What do you think about Castrol R4 synthetic SAE 5W-40 SG, JASO MA. The wether here is hot, and in the summer, very hot (Rio de Janeiro). Thank you.
 

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Hi, folks! Could somebody help on this problem? Hippo, what is your oppinion? I am talking about using Castrol R4 Superbike... Thnk you very much
 

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In time, I use Mobil 1 15w-50 SJ,( the new SL is not sold here, yet).
At trans I use Redline Heavy Shockproof, following Hippo and others advice, but I could not find Redline MTL, the one I would like to use in primary. I belive Castrol R4 is the best option I have in hand... Thanks again...
 

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Drago: Just use any decent 10W40 in the primary. It doesn't have to be synthetic in there. The new Mobil 1 SL stuff is NOT recommended for use in the primary because of some new additive or lack thereof.
 

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Drago...doesn't seem to matter what you put in the primary. Seems like everything from gear oil,auto trans fluid or even Harley primary oil has been dumped in primarys. Everybody claims "it" works good.
 

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Texxen said:
Drago...doesn't seem to matter what you put in the primary. Seems like everything from gear oil,auto trans fluid or even Harley primary oil has been dumped in primarys. Everybody claims "it" works good.

Exactly. I think I have used

1. HD's product.

2. 5w 30

3. ATF

4. synthetic ATF

5. 15 w 50 mobil 1

6. 10w 30.

7. 15w 40 diesel engine oil.

read somewhere that Hd's primary oil is basically 20 weight gear lube.
 
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