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Favorite Oil For Fd???

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Old Dec 25, 2001 | 10:13 PM
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Sweet7
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From: Hillbilly, Colorado
Favorite Oil For Fd???
Im curious guys........what is your favorite high-performance oil for your FDs...im thinking of changing oils.
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Old Dec 25, 2001 | 10:34 PM
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From: West Coast
10W40, I guess
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Old Dec 27, 2001 | 10:32 AM
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From: Ventura CA USA
NO NO NO - never 10-40 in a rotary (or any other car) it is the worst grade of oil to use - too many additives to produce the wide viscosity range. use 10-30 (winter) or 20-50 - Castrol GTX is the conventional oil of choice.
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Old Dec 29, 2001 | 02:46 AM
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Redline 20-50 here in So Cal...........
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Old Jan 2, 2002 | 03:54 PM
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So...I've been putting Castrol GTX 10w40 in my FD since I got the engine rebuilt...what exactly is the problem with this? What additives are you referring to? Why is 10w30 or 20w50 any better? Wouldn't 20w50 be a bit heavy for this rotary engine? Please cite some technical specifics so we can all benefit from this discussion
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Old Jan 2, 2002 | 05:25 PM
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Lots of research and recommendations from various tuners I go with castrol GTX 10W-30 for the winter and 20W-50 for summer that is all.
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Old Jan 4, 2002 | 09:31 AM
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Valvoline 20w50 year around in FL...Pettit uses it too.
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