Hmmm, motorcycle oil... why didn't I think of that. Makes perfect sense
when you think about it.
Alan
'52 A90
'53 BN1
'64 BJ8
On 5/16/07, Bob Haskell <rchaskell@earthlink.net> wrote:
>
> I sent an email into Castrol about our concerns with the new GF-4 oils
> (reduced levels of Zinc / ZDDP). Here is the response:
>
>
> Castrol is aware of articles in enthusiast magazines and web-sites, as
> well
> as after-market parts manufacturer discussions concerning GF-4 engine oils
> and cam-shaft durability issues in older performance vehicles. Some
> consumers suspect the lower level of ZDDP in GF-4 oils may be causing
> these
> failures. Castrol is currently investigating this issue.
>
> For those consumers that wish not to use a GF-4 oil in these vehicles,
> Castrol does offer the following products that contain Zinc at a level
> that
> is typical of the Zinc level found in oils (API SG) marketed during the
> "muscle car" era of time:
>
> The following Castrol products have Zinc levels that are typical of API SG
> oil:
>
> 1. Castrol SYNTEC 5W-40
> 2. Castrol Grand Prix 4T 10W-40 (product has been replaced by Castrol
> Motorcycle 4T 10W-40)
> 3. Castrol Grand Prix 4T 20W-50 (product has been replaced by Castrol
> Motorcycle 4T 20W-50)
> 4. Castrol GO! ATV 10W-40
> 5. Castrol GO! ATV 20W-50
> 6. Castrol TWS Motorsport 10W-60 (full synthetic, available @ BMW
> dealerships)
> 7. BMW Long Life 5W-30 (full synthetic, available @ BMW dealerships)
> 8. Castrol GO! 10W-40 Motorcycle Oil
> 9. Castrol GO! 20W-50 Motorcycle Oil
>
> We do recommend you use these oils in your classic cars, however we do not
> recommend using automotive oils in your motorcycle. Since these oils meet
> all the specifications of classic cars they are completely safe to use in
> an automobile.
>
> If installing a new performance cam in an older performance vehicle, it is
> important to:
> * follow the installation recommendations provided by the cam
> manufacturer
> * use the recommended cam break-in lube
> * prime the engine oil circuits
> * use the recommended engine oil
> * confirm valve train geometries prior to starting the engine with the
> new cam
>
> Castrol Consumer Relations
>
>
> FWIW,
>
> Bob
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