yeha, i noticed that too... for a while now!! ALL castrol anti sludge oils, are SM. THey ALL say anti sludge. So it sounds like, we shoud be sing, either group II oils only, and/or SL only, or group III's, the fake synthetics, aka, supertech synthetic, pennzoil platinum, mobil now, Coastal, valvoline synpower, castrol syntech(not including ow 30).
Update On Rinse Oil's For Auto-Rx
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