Another 4.6 oil flavor question.

Messages
6,133
Location
Texas Hill Country
I have been running GC in my 98 f150 4.6 v8 for the past 5k miles and i'm getting ready to dump it. It still looks good but i'm ready to dump it and UOA. Maybe the UOA will make me say otherwise, but i'm really not hugely impressed with it. I lost gas mileage, and a hint of performance with it. And the fact that I have to hunt for it is a bit of a pain. Anyway, i'm shopping now for something else to run until early winter here. I was going to run 5w40 Truck and SUV, but now i'm thinking of 0w30 or 0w40 mobil1. I want to stick with a synthetic in the truck so i'm not running the motorcraft blend. Any opinions?
 
Messages
507
Location
Tennessee
The 20 weights have shown fantastic results on this engine. If you want synthetic, try Mobil 1 0w20. It will increase gas mileage and free up a couple of horses.
 
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