What oil do you run?
 

I'm sure it's a common question, but just wondering what is the preferred oil by members here. I'm going to change my oil next weekend and was curious what everyone uses?

I would need a high mileage oil as I have 300k/km+

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I use conventional Havoline 10W30. In your case, a good high mileage probably would not hurt, though they have been known to cause temporary seal leakage as the old, hard seals soften up.

What oil weight & brand is everyone using?

The last time I changed the oil in the Rainier, I used Pennzoil Platinum 5w30. I like Mobil1 as well.

Mobil1 is probably the best...but it's also very expensive lol.

I haven't done my oil change yet since I got my truck (I'm doing one shortly, since I'm sure it's due). I'll probably just go with normal Pennzoil though.

I'm using Royal purple at the moment, My Blazer only has 40k miles on the original engine so its nice lol

I normally use Castrol Syntec 5w30 but now I'm switching to Mobil 1 5w30 Synthetic.

I use Valvoline 5w30 in the winter, and 10w30 in the summer in my rides.

It is recommended that any vehicle with 75k miles (150k km??) use high milage oil.

I use Penzoil High Mileage, it's treated the truck well.

Yeah, recommended by the companies that sell it. I don't have a problem with the idea of it (I have used it before in other vehicles), but I am unaware of any recommendations by tribologists or lubrication engineers as to its necessity.

Mobil 1 5w-30 synthetic. ive got about 56,000mi and i dont plan on switching to a high mileage once i get 75k. my old car had 130k+ and i used Castrol Syntec without problems or any leaks.