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Short-term, yes. Long-term, no.It would cost me more to have some lab tell me I can extend my oil changes than just doing the oil change.
There's no easy way to tell. The last thing the oil companies want is to draw attention to the phony "synthetic" issue.Interesting. Is there any way to tell what API group a specific oil is? Or is it just safe to assume that all full synthetics are group 4 while all "synthetic blends" are group 3?
GM quit suggesting 10W-40 decades ago. I could never get a straight answer "why", except that there were vague references to additive package, and "too much" additive was needed to get the wider viscosity range. The GM "Goodwrench" oils back in '83--'84 were not available in 10W-40.Read that the "additives" in conventional oils that have a wide W spread (10w-40) etc. promote varnish/coke build up UNLIKE oils that have a tighter w (10w-30). Fact or Fiction?
I'm guessing to meet CAFE (Corporate Average Fuel Economy) standards.GM quit suggesting 10W-40 decades ago. I could never get a straight answer "why", except that there were vague references to additive package, and "too much" additive was needed to get the wider viscosity range. The GM "Goodwrench" oils back in '83--'84 were not available in 10W-40.
I assumed that it was more of a "marketing" thing than an actual problem. But maybe I'm wrong.
Where are you getting DexIII? Have not been able to get it in east central IL for years.I noticed this over a year ago managing an Oreilly. Actually got cussed out a couple of times by older guys over it. Had two different guys actually come back and appologize when they realized that it was no longer being made and that we offered what was being made. Oil technology has moved on and synthetic blend will not hurt a thing. If you have a flat tappet cam go with VR1 or equivalent, but that typically starts at 10w30. From memory, don't shoot me if I am off a little, but the only real difference in the viscosity glide between 5w30 and 10w30 starts around ~0°F. Once you are above near arctic temps the oils are for all practical purposes the same. Synthetics are more eco friendly and most new engines REQUIRE them. Conventional has gone the way of straight 40wt and the dodo bird. I break every roller cam engine I build in with synthetic.
My real worry is the day they stop making DexIII. The low viscosity Dex VI in our transmissions IMO is a death sentence and causes them to die an early death.
I just saw it on the shelf last week at O'Reilys. IIRC it was Valvoline DexIII compatible.Where are you getting DexIII? Have not been able to get it in east central IL for years.
Where are you getting DexIII? Have not been able to get it in east central IL for years.