I race both 1/4 mile and Solo II for the SCCA.......
I have run 0W-30 synthetic for several years now.
I have documented that the 0W-30 will allow the engine to rev faster with less internal rotating friction.
An oil change can make the track times a few hundredths lower.
I use either Mobil-1 or Amsoil.
I change oil on the street cars every 2K miles and twice a season on the race cars. ( they get about 4 tanks of gas per year )
These are only the opinions of a career mechanic who owns a performance shop.
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2002 Dream Cruiser #435 with: over 115hp nitrous, MX-5 "burp-free" shift mod, 2003 shifter, 2001 radio, 2001 Mopar subwoofer, MX-5 designed true cold-air intake, MX-5 designed double platinum spark plugs, shory antenna, much more....
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