I would never go 8k on any oil. Always a 2500 mile kinda guy. After my 2000 miles are up will run Castrol synth. to the 3 range though. Owning a harley, there was a huge debate over synth. and dino. After I broke in my rebuild , 1000 mile, dumped Casrol synth in and watched my oil temp drop 15 degrees. Also big debate on filters, had a link and will try to post it, a guy cut like all major filters apart to see construction and such. Fram took a big hit, and Wix was near the top. I will go with a Wix on my GT. Ohh, btw I use a ford FL1-A on my sportster, same specs on check valve and presure, just a half more quart of oil for the summer. and a whole lot cheaper than a HD replacement of normal size. The new Fram Tough Gaurd for synth oils with a new type of filter element is supposed to great and was not in the above guys post as it is really new. I will be dumping my first 1000 mile oil and filter this weekend, then dino and a Wix, dump at 2000, then Castrol Synth and maybe a K&N or Wix.
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The recipe for perpetual ignorance is: be satisfied with your opinions and content with your knowledge.
Elbert Hubbard (1856 - 1915)
2003 Electric Blue GT-30,000 Miles on the clock
Stage 1, Greddy Profec II B. Turbo Chargers Wastegate set to 13#. Forge Motors BOV (Blue of course). Brand AMX Intake/AirCooler Pipes/K&N Cone with Snorkel to Fender well, MSD Coil, Live Wires(Blue of course), Factory rear sway bar, KYB struts and shocks, BTG strut tower brace, Suspension Techniques 1.3\" F/R lowering springs, ATP 3” down pipe with high flow cat, BTG axle back exhaust, Rear Spoiler. Russel Brake Lines/Hawk Brake Pads/Power Slot Cyro Rotors on a four corners
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