Originally Posted By: Poppi
Also Garak, I had never heard of DELO until I bought this truck. Tried to look up distributors in my area but when I called them, they couldn't get it. Will 5W30 offer more protection to my engine?
Were they actual Chevron distributors to whom you spoke? If they can't help, check a truck stop or even a couple local trucking firms. Up here at least, they tend to stock a lot of Chevron stuff at good prices.
Note that the Delo 5w-30 is a bit thicker than the ILSAC rated 5w-30 oils that would normally be used in your vehicle. And no, the gas mileage difference will not be significant. Additional protection, if any, won't be significant either, I would suggest. But, the Delo is a good oil and a bit thicker. It will be at least as thick as the Mobil 1 HM, but will also have reduced phosphorus and a nice high TBN, if one were to extend OCIs.
If you want to stick with Delo, perhaps their 10w-30 might be a little more cost effective for your shorter intervals. A high mileage oil would also be worth a shot. Note that if they're going to do something useful, they usually take a little while to start working. Too many guys jump ship on them after 3,000 miles and try something else, which doesn't help a lot.