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 5w30 is a bit thicker than the ILSAC rated 5w30 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 High Mileage, 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 10w30 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.