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Re: [Shop-talk] Oil analysis - Blackstone

To: "David C." <cavanadd@frontier.com>
Subject: Re: [Shop-talk] Oil analysis - Blackstone
From: Bob Spidell <bspidell@comcast.net>
Date: Sun, 26 Jun 2011 15:46:46 -0700
This topic has been beat to death on other lists (the Healey list for one).  
The consensus is Valvoline VR-1 racing 
still has adequate ZDDP.  Besides that, there are some specialty brands that 
still have ZDDP, or you can go with a 
synthetic like Redline, or use an additive.   Some swear by diesel oils like 
Shell(?) Rotella.  Castrol may still have 
some ZDDP in the 20W-50 oil, but the oil companies have been kinda coy about 
revealing what's really in their stuff.

Dunno about aircraft oils.  Light plane engines are usually hydraulic 
lifter/pushrod engines, so the oil would  need 
some extreme pressure additive  (and no cat to worry about).  OTOH, A/C oils 
are formulated to handle the lead still in 
avgas and all the blowby from the sloppy clearances in big air-cooled engines 
(Mobil 1 for A/C didn't fare well).  
Generally they aren't recommended for automotive use, but might be OK in an 
air-cooled bike.

Bob



On 6/26/2011 11:24 AM, David C. wrote:
> OK, I have a 1986 BMW R80RT (motorcycle) with pushrods and solid lifters.  
>Any recommendations for oil for a vintage 
> engine (I have been using GTX 20W50).  Aero oils?
>
>
>
> John Miller wrote:
>>
>> For older engines, especially flat-tappet pushrod engines but really any
>> engine with a lot of bits that slide on each other under high pressure,
>> it can be a very bad thing.
> _______________________________________________
>

-- 
*******************************************************************
Bob Spidell           San Jose, CA            bspidell@comcast.net

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