1. What kind of vehicle you have 2006 Lotus Exige with aftermarket BOE 300 Supercharger 2. What your owner's manual says -- not just viscosity, but certifications (look for acronyms like API SM, ILSAC GF-4, etc.) and change intervals as well Viscosity: 5W/40 Quality Standard: API SJEC, ILSAC, ACEA A3 Normal driving oil change interval: 7500 miles With vigorous driving: 4000 miles 3. Where you live Coastal CT 4. How you drive (easy? hard? fast? slow?) All driving in this car is either weekend drives (usually 20-100 miles at a time), autocross, or track days. All driving is fairly aggressive. The oil has to stand up to track days. The car is driven about 1000 miles per year. 5. What your daily drive is like (short trips? long trips? city? highway?) The car is not a daily driver. 6. Whether your car has any known problems The car does have known issue with cams wiping. A lot of theories around this, and some think it's because the oil is not warmed enough to circulate. These cars have the odd problem of TOO MUCH oil cooling and it's difficult to get them up to temp, even on the track. http:/
I have seen a few oils recommended. Mobil 1 0w40, not sure if appropriate for track?
Have also seen Redline HP 5w40 suggested. As well as Redline 40W Race Oil. I have no cats. Straight through exhaust. www.lotustalk.com/ forums/ f25/ camshaft-cover-defect-causing-rocker-arm-breakage-p1302-50594/