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What qualities would be best to reduce emissions from the tailpipe? Would it simply be choosing an oil which doesn't burn off, or would using a diesel rated oil in a passenger car keep emissions lower? My car is well-tuned and in good condition, and I don't have emissions inspections, I'm just...

I have a '94 Explorer. The A/C condenser works, but the air will not blow out of the vents. Well, not reliably, anyway. Sometimes it will work perfectly, other times it won't turn on. Sometimes it will start to blow as I drive, other times not for a few days. I'm not sure where to start. I have...

I'm curious as to whether it's possible to create a synthetic oil using re-refined base stock? I have no problem using products like Eco-Power or Valvoline's NextGen, but one of my cars has a turbo in which I use full syn. Anyone think Valvoline or another manufacturer will come out with a...

Since most HM oils are thicker than their regular counterparts, would it be feasible to replace a regular, non-HM 5w30 with a HM 5w20? For instance, would Pennzoil 5w20 HM (or any other 5w20 HM oil) be comparably as thick as regular PYB 5w30 (or any other 5w30 brand)?

I'm currently running Mobil 1 AFE 0w30 on a 10,000m OCI in my 200,000+ miles '94 Explorer, and the oil has found many small leaks (not enough to ever have to add any makeup oil). I want to change to a HM oil next time. Any reason to think M1 5w30 HM @ 10,000m OCI would work any less at stopping...

I have a '94 Explorer Sport, v6 with 205,000 miles on it. It is NOT retrospec'd to use 5w20 like some other Ford models of its vintage. I've been reading a lot of Dr. Haas's material on the benefit of running very thin oils, and have decided to give it a try. I'm changing my oil this weekend...

I just got my first UOA back from Blackstone! Now how do I post it? I thought I read some directions a few weeks ago, but haven't been able to find them with the search!

Does anyone see any problems with using this in an 11 year old low-pressure turbo'd XC70 with 175,000 miles? I do 7500 mile OCIs and it takes about 6 months to hit that mileage, about 75% backroads cruising and 25% city driving. It's driven very gently. The reason I ask is because I usually have...

Anyone know of a synthetic oil available in the US that's made from re-refined oil? I've read about WM ST Syn possibly being a re-refined oil, but cannot find a definative answer. I just bought a case of Eco-Power recycled oil for my Explorer, but am a little hesitant to use it in my turbo Volvos.

Second post! Woo-hoo! I WANT to settle on one oil! I am not interested in switching back and forth between viscosities. I currently have 2 Volvos in the stable. My wife's '99 V70 XC and my '05 S80. Both cars have a 2.5T turbo engine. Acceptable viscosities are 5w30, 10w30 and 5w40. Her older car...

Very long-time lurker here, first post. I have a 2005 Mazda6 sport wagon. I've always changed the oil every 5000 miles with either PZYB or MC 5w20 and a MC filter. The car has 55,000 miles on it and has belonged to me since it was 12,000 miles old. I want to stretch out the OCI to 7500 miles so...