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My Z's motor has 164K on the factory original bottom-end. Runs well, gets reasonable gas milage and pulls strong. Uses some oil between changes when I drive it hard. I'v been using Mobile One 10w-40 without complaint---except for the expense. I'd like to switch to Rotella T Synthetic 5W-40 since...

My 1976 280Z 4-speed has 165K actual miles on the bottom end of its original 2.8 liter EFI inline 6 motor. The motor pulls 18 1/2 inches of vacuum at a hot 900 rpm idle. The cylinder head was redone about 10k miles ago. It's a bit cold blooded on a cold morning. But otherwise runs well, pulls...

My 56 Chevy is a stock 2V/265 V8 rebuilt 15,000 miles ago. The motor is 8:1 compression and has a mild flat tappett cam. Runs well with a bit of blowby and minimal comsumption. The car gets driven 1000 miles per year and will ocassionally run 70 mph hours at a time without incident or issue...

For 2 years I 'v used Mobil 1 15W-50 in my Z car. Except for a header, it's bone stock. The car was never equipped with a catalytic converter. It consumes VERY LITTLE oil between changes and has 150K miles on the bottom end. The car has a 4-speed manual, factory a/c and I drive it HARD. As some...