I just use mineral based oil and replace it every 3000 kms ore 3 months that goes with the oil filter.

 

TrailBlazer - 10W-30 Mobil 1 full synthetic motor oil and there oil filter

Truck - 5W-30 Royal Purple HPS Series motor oil and there oil filter

 

Forgot to mention the brand I'm using. I only use Motul and Mobil 1 oil and oem filter.

 

Amsoil

I change my oil every 6 months (the XL is rated 6 months or 10K miles)

Amsoil Synthetic 5W30 XL Motor Oil $45.50 (8 Qts)
Amsoil Absolute Efficiency Oil Filter $12.65

 

I use regular mobil super 5000 and change oil usually every 5000-7000k.works for me.5w30

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change oil every 10k miles, mobile one synthetic oil

I use 5w-30 mobile one + mobile one synthetic filter. 10k miles between oil changes. To learn more about oil check out Bob is the oil guy. http://www.bobistheoilguy.com/motor-oil-101/ Very interesting topic. And usually send my oils off to Blackstone Labs for analysis. Before using Blackstone I changed oil every 5k miles.

redbeard