"oils NOT to use ..."
1. Price is of almost no relevance in my opinion. I've seen Havoline, Pennzoil, and other reputable oils down in the 50 cent range after promotions, and I've also seen Pennzoil for $2.69 regular price at grocery stores. Strictly marketing-based pricing with not much rhyme or reason, and certainly no reflection of quality or lack of same.
2. I've seen perfectly decent UOAs (iron/lead/copper wear near 10 ppm) on most or all of the second and third tier oils like Shell Formula, Citgo, Kendall, etc., so just because a brand isn't one of the biggest doesn't mean it won't perform.
3. "oils NOT to use ..." I'd say any oil in which you don't have reasonably full confidence in the certifications claimed. If Pennzoil says it meets the "SL" spec. and Mobil 1 claims to meet ACEA A3, I have little reason to doubt either. But Rite Aid or Safeway brand oils? I can see these oils being just what they claim to be, but I also wouldn't be surprised if they turned out to be "lowest bidder...PERIOD" oils from unknown or offshore suppliers. Don't get much of a "warm & fuzzy" with oils like that.
1. Price is of almost no relevance in my opinion. I've seen Havoline, Pennzoil, and other reputable oils down in the 50 cent range after promotions, and I've also seen Pennzoil for $2.69 regular price at grocery stores. Strictly marketing-based pricing with not much rhyme or reason, and certainly no reflection of quality or lack of same.
2. I've seen perfectly decent UOAs (iron/lead/copper wear near 10 ppm) on most or all of the second and third tier oils like Shell Formula, Citgo, Kendall, etc., so just because a brand isn't one of the biggest doesn't mean it won't perform.
3. "oils NOT to use ..." I'd say any oil in which you don't have reasonably full confidence in the certifications claimed. If Pennzoil says it meets the "SL" spec. and Mobil 1 claims to meet ACEA A3, I have little reason to doubt either. But Rite Aid or Safeway brand oils? I can see these oils being just what they claim to be, but I also wouldn't be surprised if they turned out to be "lowest bidder...PERIOD" oils from unknown or offshore suppliers. Don't get much of a "warm & fuzzy" with oils like that.