Hello List,
Disclaimer: I do not have any connections or inside information about motor
oils or any additives. Please take the information in this e-mail and links
for what it is worth. I am only stating my thoughts and opinion about the
subject. Sometimes peoplebs opinions contradict one another. I received a
written response from Castrol concerning flat tappet camshafts and oil
recommendations.
The question posed to Castrol;
I have a british engine that has a flat tappet camshaft. Which Castrol motor
oils are recommended for a flat tappet camshaft engine? I understand that the
zinc and molybdenum disulfide percentage was decreased or eliminated in the
new API service ratings.
Thank You
The response from Castrol;
Thank you for contacting Castrol,
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 20W-50 (*NEWLY FORMULATED classic oil formula - see link to
website below for information on our new 20W-50 product)
2. Castrol SYNTEC 5W-40
3. Castrol Grand Prix 4T 10W-40 (product has been replaced by Castrol
Motorcycle 4T 10W-40)
4. Castrol Grand Prix 4T 20W-50 (product has been replaced by Castrol
Motorcycle 4T 20W-50)
5. Castrol GO! ATV 10W-40
6. Castrol GO! ATV 20W-50
7. Castrol TWS Motorsport 10W-60 (full synthetic, available @ BMW
dealerships)
8. BMW Long Life 5W-30 (full synthetic, available @ BMW dealerships)
9. Castrol GO! 10W-40 Motorcycle Oil
10. Castrol GO! 20W-50 Motorcycle Oil
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 valvetrain geometries prior to starting the engine with the new
cam
*
http://www.castrol.com/castrol/genericarticle.do?categoryId=82915470&contentI
d=7032644
Castrol Consumer Relations
My opinion is stated in the next e-mail Update 2
Regards, Greg Perry
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