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I'm running 5w-30 GTX on my 07 Yaris at 6 month OCI's which are usually approx 3,500 miles.

I think it's pretty cool to get a new Lexus engine from the stealership at 265k miles

Originally Posted By: Max_Wander For a Yaris, you'd be fine with good ol' classical mineral oil; the little 1NZ isn't very hard on oil at all IMO. I've been using GTX 5w-30 with approx 3,500k OCI's at 6 months

I actually own a 07 Yaris LB now ... got to change my user name.

Yeah, it's right at 6 miles one way and other trips to the grocery, etc... are usually less than 2 miles

Probably 80% or more of my travel is commuting in rush hour traffic. I only average approx 7k mile per year or 3,500 miles per OCI.

I'm an apartment dweller, so I rely on quick change oil places. In my neighborhood I can get a Penzoil Platinum oil change, but it comes with a FRAM filter. Is it worth it? Or, should I stick will a place that offers dino changes and other brands of filters?

The greater majority of my trips are shorter than 6 miles, e.g, work, grocery, etc ...

Originally Posted By: buster Maybe a slight increase, but nothing significant IMO. 1-2 mpg at most. I'd be thrilled with a 2 mpg increase :)

There was supposedly a TSB issued suggesting 5w-20 in my 07 Yaris LB as opposed to the 5w-30 listed in the owner's manual. If I change, and go synthetic M1 or PP will I see an increase in mpg?

I don't see that significant of a difference in real world reporting between the 4 cylinder Malibu and the 3.5l Impala. As a matter of fact I regular read reports of 3.5 owners beating the EPA estimates.

The used 3.8l GP seems like a good deal. I like the 3.8, it's the rest of the platform of the Grand Prix that I'm not so crazy about.

The new Malibu has the 2.4l ecotec in the base model LS. It doesn't get near the fuel economy of the 2.2l from the last generation.

I'm surpised at the real world gas mileage numbers I've read on the Impala. The 3.5 V6 competes favorably with many 4 cylinders including Camry/Accord/Altima.

Thanks for your input. I'm leaning towards the Impala.

That would be my determining factor. I would pick the one with the best ride quality. From owner's reviews I've read, they both have a quiet, smooth ride.

Aren't they 100k spark plugs?

I don't think the mpg advantage for the 4 cylinder Malibu is significant. It does seem to do as well as the last generation Malibu. http://www.fueleconomy.gov/mpg/MPG.do?action=mpgData&vehicleID=24367&browser=true&details=on

Right now with rebates you can get a 08 Impala 3.5l V6 for the near the same price of the new Malibu LS. Which would you pick?

and side airbags are standard