oil

Hi everyone, I have a 2003 protege 5 with the stock 2.0 and during the summer with the recommended 5w-20 it would crank a lot to start so I switch to 5w30 mobil one synthetic, and now when it's -20'C it cranks for 3-4 seconds before starting, and I was wondering if 0w-40 Synthetic would help the...

So my girlfriend and I are heading down to vegas in August, which will be around a 5000 km round trip. We are taking my P5 with 140,000 km on it, and it has not been behaving lately. Every time I start it in the morning, it puffs out a dense cloud of black smoke. It seems worse on cold...