Originally Posted by dataiv

Hi, I live just outside Toronto. Been using Mobil 1 15W50 since the summer and the car has been down to about -18 overnight while outside a couple times. No trouble cranking and oil pressure still shoots right up to 3 very quickly.

Every bottle of 15W50 I bought so far has been at Canadian Tire. It was on sale for about 3 or 4 weeks before Christmas, the big jug was 28.99 I believe. Normally it's 32.99 I think.

I actually filled up with Sunoco diesel today, and decided I would use the "GOLD Diesel" instead this time. It was 79.9 cents/L instead of 77.9. The car definitely has way more oomph now with this fuel. I'm sure it has a higher cetane rating, and it says a few other things like better lubricity and some other additives on Sunoco's website. The car is a bit like a rocket though now. Remarkably noticeable difference though. I'd love to know what the actual cetane rating is compared to normal Sunoco diesel.

Maybe it's time to start using some kind of cetane booster regularly, and if so, has anyone that is using one noticed that it makes any difference in mileage? I expect it would...