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I have an '03 Protege 5 - have tried the following: Mobil Clean 5000 10/30 - quiet running Pennzoil Platinum 5/30 - quiet running Pennzoil Yellow Bottle 10/30 - quiet running Valvoline Synpower 5/30 - tons of valvetrain noise Personally, I'd pick a Pennzoil product in 5 or 10/30 and keep it there.

I don't think it's any lack of respect from the forum - GTX has been around for so many years, I think it just gets lost in the shuffle when new products hit the shelves. The UOA's posted for GTX are typically very good.

I use and like both. I put Ultra 5-30 in my Mazda Protege5 about 300 miles ago. Once the car is warm, it 'seems' a lot quieter and smoother than the last fill (Platinum 5-30). My first tank of gas on the Ultra fill did net about a 4MPG increase without a change in driving mix or habits - not...

2 qts Pennzoil Ultra 5-30 5 qts Valvoline Synpower 5-30 5 qts Mobil 1 0-40 (Euro) 2 qts Castrol 0-30 (GC) 2 qts Pennzoil Platinum 5-30 5 qts Pennzoil Platinum 10-30 BITOG running total: 26,071