Re: oil light on and off...even after oil change
Don't forget about the mileage penalty with 5w 40. I'd say it would drop about 10 percent due to increased load on the oil pump.
I had a similar experience running 5w 50 on my 2.0 L Cavalier one hot summer! Though I lost more like 15% of my mileage. But I went from about 40 PSI to 70 PSI O.P. at idle!
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Base '03, Light Almond Pearl Metallic - Modified 2.4 na w/ported head, 10.4:1 compression ratio & Crane #10 camshafts - 4 speed - Energy Poly bushings - Napa ceramic pads & Ultra premium rotors - Rotora Stainless brake lines - Extreme Acc. Xenon HID 8k low & 6k high
Dark taupe & Ivory Interior, Factory CD w/Sirius Stratus 4, Power Acoustik 840w 4ch, Boss 200w 2ch w 10" bandpass sub, 2 sets Phoniex Gold Matched comp. speakers
Rolling stock: 16" SE A7w 225/50/16 Kuhmo Ecsta AST - One of the nicest Light Almond PT's you'll find 
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