Originally Posted By: daves87rs
Okay...if that 4.2 is burning oil anyways, why would one WASTE any kind of good money on oil? Cheapest certified oil on the shelf would have got my vote.
Those engines remind me a bit of the saturn s series engines...they'll run for darn near even if you keep them filled with oil...
The mechanic is putting in some kind of conventional 10W-40. Whatever oil it is.. doesnt seem to be working too well. And im starting to think its because of the grade and STP (yes it is confirmed additive. As to the fill: Its probably NAPA oil, or bulk oil as suggested.) It sounds dieselish when its low. So i put in the M1 AFE 0W-30 to combat this inferior oil. Sort of the "running oil change" sort of not. Its now full up very nice and ill continue to monitor it.
And, remember: ~1000miles+ per week. Thats a lot of use. Decided to "just get the M1." Wasnt expecting it to cost twice as much.. coulda been the NAPA.. oh well, the oil got in there. Vehicle, engine > Oil price. Maybe M1 will clean something up?
Even if the price was wrong, or this NAPA didnt participate.. the instruction was: "Check oil BEFORE we go out today." So, imagine my
when we then drove to Walmart............
I put in the M1 AFE 0W-30 and i think the engine sounds a bit quieter. It totally presented an opportunity to see what the M1 would do in the engine. its "mixing with the STP and the 10W-40 thats in there." Who knows? Maybe it will slow the burning.
Was tempted to put MMO in there too.. didnt. But it does sound less like a Mack truck on start now. (
Cold carbon knock. This particular 03 GMC Envoy XL has it. A lot.)
Put a bottle of Chevron Techron last week, chose it over Seafoam as per last advice received.
I think daves87rs nailed it. Addressing why I chose M1.. I think cheap oil got it possibly burning in the first place.
I also remember this board voted 5W-30 for the vehicle, so I went 0W-30. That had a play in it too. Didnt choose the 0W-20 that was next to it.. its over, done. Truck runs better. Whether that is due to the M1 AFE specifically or just OIL is diff story.